Remove generated pyc files and update licenses.golden. (#3415)

See issue flutter/flutter#8115

travis/licenses.golden

@@ -18501,12 +18501,6 @@ LIBRARY: colorama
 ORIGIN: ../../../third_party/colorama/src/LICENSE.txt
 TYPE: LicenseType.bsd
 FILE: ../../../third_party/colorama/src/MANIFEST.in
-FILE: ../../../third_party/colorama/src/colorama/__init__.pyc
-FILE: ../../../third_party/colorama/src/colorama/ansi.pyc
-FILE: ../../../third_party/colorama/src/colorama/ansitowin32.pyc
-FILE: ../../../third_party/colorama/src/colorama/initialise.pyc
-FILE: ../../../third_party/colorama/src/colorama/win32.pyc
-FILE: ../../../third_party/colorama/src/colorama/winterm.pyc
 FILE: ../../../third_party/colorama/src/screenshots/ubuntu-demo.png
 FILE: ../../../third_party/colorama/src/screenshots/windows-demo.png
 ----------------------------------------------------------------------------------------------------
@@ -19753,7 +19747,6 @@ FILE: ../../../dart/runtime/observatory/web/favicon.ico
 FILE: ../../../dart/runtime/observatory/web/index.html
 FILE: ../../../dart/runtime/observatory/web/third_party/trace_viewer_full.html
 FILE: ../../../dart/runtime/observatory/web/timeline.html
-FILE: ../../../dart/runtime/tools/utils.pyc
 FILE: ../../../dart/runtime/vm/snapshot_test_in.dat
 FILE: ../../../dart/samples/build_dart/test.foo
 FILE: ../../../dart/samples/build_dart_simple/test.foo
@@ -72114,4 +72107,4 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 ====================================================================================================
 Total license count: 695
-     31548 of 31548 ██████████ 100% (0 missing licenses)  Done.    
+     31541 of 31541 ██████████ 100% (0 missing licenses)  Done.