De-dup FILE output for each license (#10945)

Only list each file once per license block.

ci/licenses_golden/licenses_third_party

@@ -2159,7 +2159,6 @@ FILE: ../../../third_party/angle/src/compiler/translator/VersionGLSL.cpp
 FILE: ../../../third_party/angle/src/compiler/translator/VersionGLSL.h
 FILE: ../../../third_party/angle/src/compiler/translator/glslang.l
 FILE: ../../../third_party/angle/src/compiler/translator/glslang.y
-FILE: ../../../third_party/angle/src/compiler/translator/glslang.y
 FILE: ../../../third_party/angle/src/compiler/translator/glslang_tab.cpp
 FILE: ../../../third_party/angle/src/compiler/translator/tree_ops/ArrayReturnValueToOutParameter.cpp
 FILE: ../../../third_party/angle/src/compiler/translator/tree_ops/ArrayReturnValueToOutParameter.h
@@ -2830,7 +2829,6 @@ FILE: ../../../third_party/angle/src/compiler/preprocessor/DirectiveParser.h
 FILE: ../../../third_party/angle/src/compiler/preprocessor/ExpressionParser.cpp
 FILE: ../../../third_party/angle/src/compiler/preprocessor/ExpressionParser.h
 FILE: ../../../third_party/angle/src/compiler/preprocessor/ExpressionParser.y
-FILE: ../../../third_party/angle/src/compiler/preprocessor/ExpressionParser.y
 FILE: ../../../third_party/angle/src/compiler/preprocessor/Lexer.cpp
 FILE: ../../../third_party/angle/src/compiler/preprocessor/Lexer.h
 FILE: ../../../third_party/angle/src/compiler/preprocessor/Macro.h
@@ -3197,16 +3195,12 @@ FILE: ../../../third_party/boringssl/ios-aarch64/crypto/fipsmodule/sha512-armv8.
 FILE: ../../../third_party/boringssl/ios-arm/crypto/fipsmodule/aes-armv4.S
 FILE: ../../../third_party/boringssl/ios-arm/crypto/fipsmodule/bsaes-armv7.S
 FILE: ../../../third_party/boringssl/ios-arm/crypto/fipsmodule/sha256-armv4.S
-FILE: ../../../third_party/boringssl/ios-arm/crypto/fipsmodule/sha256-armv4.S
-FILE: ../../../third_party/boringssl/ios-arm/crypto/fipsmodule/sha512-armv4.S
 FILE: ../../../third_party/boringssl/ios-arm/crypto/fipsmodule/sha512-armv4.S
 FILE: ../../../third_party/boringssl/linux-aarch64/crypto/fipsmodule/sha256-armv8.S
 FILE: ../../../third_party/boringssl/linux-aarch64/crypto/fipsmodule/sha512-armv8.S
 FILE: ../../../third_party/boringssl/linux-arm/crypto/fipsmodule/aes-armv4.S
 FILE: ../../../third_party/boringssl/linux-arm/crypto/fipsmodule/bsaes-armv7.S
 FILE: ../../../third_party/boringssl/linux-arm/crypto/fipsmodule/sha256-armv4.S
-FILE: ../../../third_party/boringssl/linux-arm/crypto/fipsmodule/sha256-armv4.S
-FILE: ../../../third_party/boringssl/linux-arm/crypto/fipsmodule/sha512-armv4.S
 FILE: ../../../third_party/boringssl/linux-arm/crypto/fipsmodule/sha512-armv4.S
 FILE: ../../../third_party/boringssl/src/crypto/err/asn1.errordata
 FILE: ../../../third_party/boringssl/src/crypto/err/bio.errordata
@@ -7989,8 +7983,6 @@ FILE: ../../../third_party/dart/sdk/lib/core/string.dart
 FILE: ../../../third_party/dart/sdk/lib/core/type.dart
 FILE: ../../../third_party/dart/sdk/lib/core/uri.dart
 FILE: ../../../third_party/dart/sdk/lib/html/dart2js/html_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/html/dart2js/html_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/html/dart2js/html_dart2js.dart
 FILE: ../../../third_party/dart/sdk/lib/html/dartium/nativewrappers.dart
 FILE: ../../../third_party/dart/sdk/lib/html/html_common/conversions.dart
 FILE: ../../../third_party/dart/sdk/lib/html/html_common/css_class_set.dart
@@ -8012,26 +8004,8 @@ FILE: ../../../third_party/dart/sdk/lib/isolate/isolate.dart
 FILE: ../../../third_party/dart/sdk/lib/math/math.dart
 FILE: ../../../third_party/dart/sdk/lib/math/random.dart
 FILE: ../../../third_party/dart/sdk/lib/svg/dart2js/svg_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/svg/dart2js/svg_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/svg/dart2js/svg_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/svg/dart2js/svg_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/svg/dart2js/svg_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/svg/dart2js/svg_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
 FILE: ../../../third_party/dart/sdk/lib/web_audio/dart2js/web_audio_dart2js.dart
 FILE: ../../../third_party/dart/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_gl/dart2js/web_gl_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
 FILE: ../../../third_party/dart/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ -9104,7 +9078,6 @@ FILE: ../../../third_party/dart/runtime/vm/thread_interrupter_linux.cc
 FILE: ../../../third_party/dart/runtime/vm/thread_interrupter_macos.cc
 FILE: ../../../third_party/dart/runtime/vm/thread_interrupter_win.cc
 FILE: ../../../third_party/dart/sdk/lib/_chrome/dart2js/chrome_dart2js.dart
-FILE: ../../../third_party/dart/sdk/lib/_chrome/dart2js/chrome_dart2js.dart
 FILE: ../../../third_party/dart/sdk/lib/_http/http.dart
 FILE: ../../../third_party/dart/sdk/lib/_http/http_headers.dart
 FILE: ../../../third_party/dart/sdk/lib/_http/http_impl.dart
@@ -10007,7 +9980,6 @@ FILE: ../../../third_party/freetype2/src/gxvalid/gxverror.h
 FILE: ../../../third_party/freetype2/src/gxvalid/gxvfeat.c
 FILE: ../../../third_party/freetype2/src/gxvalid/gxvfeat.h
 FILE: ../../../third_party/freetype2/src/gxvalid/gxvfgen.c
-FILE: ../../../third_party/freetype2/src/gxvalid/gxvfgen.c
 FILE: ../../../third_party/freetype2/src/gxvalid/gxvjust.c
 FILE: ../../../third_party/freetype2/src/gxvalid/gxvkern.c
 FILE: ../../../third_party/freetype2/src/gxvalid/gxvlcar.c
@@ -16194,7 +16166,6 @@ FILE: ../../../third_party/icu/source/samples/layout/GnomeFontMap.h
 FILE: ../../../third_party/icu/source/samples/layout/GnomeGUISupport.cpp
 FILE: ../../../third_party/icu/source/samples/layout/GnomeGUISupport.h
 FILE: ../../../third_party/icu/source/samples/layout/LayoutSample.rc
-FILE: ../../../third_party/icu/source/samples/layout/LayoutSample.rc
 FILE: ../../../third_party/icu/source/samples/layout/RenderingSurface.h
 FILE: ../../../third_party/icu/source/samples/layout/ScriptCompositeFontInstance.cpp
 FILE: ../../../third_party/icu/source/samples/layout/ScriptCompositeFontInstance.h
@@ -17615,12 +17586,8 @@ FILE: ../../../third_party/libjpeg-turbo/jcmarker.c
 FILE: ../../../third_party/libjpeg-turbo/jcmaster.c
 FILE: ../../../third_party/libjpeg-turbo/jcomapi.c
 FILE: ../../../third_party/libjpeg-turbo/jconfig.h
-FILE: ../../../third_party/libjpeg-turbo/jconfig.h
-FILE: ../../../third_party/libjpeg-turbo/jconfig.h.in
 FILE: ../../../third_party/libjpeg-turbo/jconfig.h.in
 FILE: ../../../third_party/libjpeg-turbo/jconfigint.h
-FILE: ../../../third_party/libjpeg-turbo/jconfigint.h
-FILE: ../../../third_party/libjpeg-turbo/jconfigint.h.in
 FILE: ../../../third_party/libjpeg-turbo/jconfigint.h.in
 FILE: ../../../third_party/libjpeg-turbo/jcparam.c
 FILE: ../../../third_party/libjpeg-turbo/jcphuff.c
@@ -17672,7 +17639,6 @@ FILE: ../../../third_party/libjpeg-turbo/jmemnobs.c
 FILE: ../../../third_party/libjpeg-turbo/jmemsys.h
 FILE: ../../../third_party/libjpeg-turbo/jmorecfg.h
 FILE: ../../../third_party/libjpeg-turbo/jpeg_nbits_table.h
-FILE: ../../../third_party/libjpeg-turbo/jpeg_nbits_table.h
 FILE: ../../../third_party/libjpeg-turbo/jpegcomp.h
 FILE: ../../../third_party/libjpeg-turbo/jpegint.h
 FILE: ../../../third_party/libjpeg-turbo/jpeglib.h
@@ -17683,7 +17649,6 @@ FILE: ../../../third_party/libjpeg-turbo/jstdhuff.c
 FILE: ../../../third_party/libjpeg-turbo/jutils.c
 FILE: ../../../third_party/libjpeg-turbo/jversion.h
 FILE: ../../../third_party/libjpeg-turbo/libjpeg.map.in
-FILE: ../../../third_party/libjpeg-turbo/libjpeg.map.in
 FILE: ../../../third_party/libjpeg-turbo/rdbmp.c
 FILE: ../../../third_party/libjpeg-turbo/rdcolmap.c
 FILE: ../../../third_party/libjpeg-turbo/rdgif.c
@@ -17694,16 +17659,11 @@ FILE: ../../../third_party/libjpeg-turbo/rdswitch.c
 FILE: ../../../third_party/libjpeg-turbo/rdtarga.c
 FILE: ../../../third_party/libjpeg-turbo/simd/jcsample.h
 FILE: ../../../third_party/libjpeg-turbo/simd/jpeg_nbits_table.inc
-FILE: ../../../third_party/libjpeg-turbo/simd/jpeg_nbits_table.inc
 FILE: ../../../third_party/libjpeg-turbo/simd/jsimdcfg.inc
-FILE: ../../../third_party/libjpeg-turbo/simd/jsimdcfg.inc
-FILE: ../../../third_party/libjpeg-turbo/simd/jsimdcfg.inc.h
 FILE: ../../../third_party/libjpeg-turbo/simd/jsimdcfg.inc.h
 FILE: ../../../third_party/libjpeg-turbo/transupp.c
 FILE: ../../../third_party/libjpeg-turbo/transupp.h
 FILE: ../../../third_party/libjpeg-turbo/turbojpeg-mapfile
-FILE: ../../../third_party/libjpeg-turbo/turbojpeg-mapfile
-FILE: ../../../third_party/libjpeg-turbo/turbojpeg-mapfile.jni
 FILE: ../../../third_party/libjpeg-turbo/turbojpeg-mapfile.jni
 FILE: ../../../third_party/libjpeg-turbo/wrbmp.c
 FILE: ../../../third_party/libjpeg-turbo/wrgif.c
@@ -19915,7 +19875,6 @@ FILE: ../../../third_party/dart/third_party/observatory_pub_packages/packages/ch
 FILE: ../../../third_party/dart/third_party/observatory_pub_packages/packages/charted/lib/svg/shapes/line.dart
 FILE: ../../../third_party/dart/third_party/observatory_pub_packages/packages/charted/lib/svg/shapes/rect.dart
 FILE: ../../../third_party/dart/third_party/observatory_pub_packages/packages/charted/tool/build_unicode_segmentation_data.dart
-FILE: ../../../third_party/dart/third_party/observatory_pub_packages/packages/charted/tool/build_unicode_segmentation_data.dart
 FILE: ../../../third_party/dart/third_party/observatory_pub_packages/packages/charted/tool/hop_runner.dart
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2013, Google Inc.

ci/licenses_golden/tool_signature

-Signature: e446a6af93ba7d07fcb4170016dd6bd1
+Signature: 6094aeb823d406e3a1a7f3141a7fb188
 

tools/licenses/lib/licenses.dart

@@ -395,8 +395,7 @@ abstract class License implements Comparable<License> {
   final String origin;
   final LicenseType type;
 
-  Iterable<String> get licensees => _licensees;
-  final List<String> _licensees = <String>[];
+  final Set<String> _licensees = <String>{};
   final Set<String> _libraries = <String>{};
 
   bool get isUsed => _licensees.isNotEmpty;
@@ -419,7 +418,8 @@ abstract class License implements Comparable<License> {
   String toString() {
     final List<String> prefixes = _libraries.toList();
     prefixes.sort();
-    _licensees.sort();
+    final List<String> licensees = _licensees.toList();
+    licensees.sort();
     final List<String> header = <String>[];
     header.addAll(prefixes.map((String s) => 'LIBRARY: $s'));
     header.add('ORIGIN: $origin');