Roll Dart SDK to e9243a4d16cef962214d6d1f433bc2cd3fe864e6 (#4509)

DEPS

@@ -31,7 +31,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/master/DEPS.
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'e122f4825726035e4579471ef83848b1aa796444',
+  'dart_revision': 'e9243a4d16cef962214d6d1f433bc2cd3fe864e6',
 
   'dart_args_tag': '0.13.7',
   'dart_async_tag': '2.0.0',

travis/licenses_golden/licenses_third_party

-Signature: da364ae304275fa7646e2f477e1e6241
+Signature: 0539612b4ef14aaf6c11fb3a0a0464ea
 
 UNUSED LICENSES:
 
@@ -4683,7 +4683,6 @@ 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
 for details. All rights reserved.
@@ -5124,6 +5123,7 @@ FILE: ../../../third_party/dart/sdk/lib/io/namespace_impl.dart
 FILE: ../../../third_party/dart/sdk/lib/io/overrides.dart
 FILE: ../../../third_party/dart/sdk/lib/io/sync_socket.dart
 FILE: ../../../third_party/dart/sdk/lib/vmservice/named_lookup.dart
+FILE: ../../../third_party/dart/utils/bazel/kernel_summary_worker.dart
 ----------------------------------------------------------------------------------------------------
 Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 for details. All rights reserved.