Roll src/third_party/dart 6c81690c3a..c6a14f4459 (13 commits)

dart-lang/sdk@c6a14f4459 [vm/fuzzer] Fix heapsize
dart-lang/sdk@8dcf5cb413 Remove IncrementalAstCloner and TokenMap.
dart-lang/sdk@034c529cd1 Ignore failing test on Windows.
dart-lang/sdk@7472da8e25 Make allowInterop idempotent in DDC
dart-lang/sdk@bd3792e714 Remove unused MapIterator and implementations.
dart-lang/sdk@fa879f2b18 Stop using ClassElement.type in ElementResolver, infer annotation constructor type arguments.
dart-lang/sdk@80c045ee82 [vm/fuzzer] Fix non minimized test runs
dart-lang/sdk@e6574a7964 [vm] Add --show-invisible-isolates.
dart-lang/sdk@cd51a30805 Remove deprecated 'assertErrorCodesInCode'.
dart-lang/sdk@d1256a23f9 Deprecate 'useDart2jsPaths' in SdkLibrariesReader and make it optional.
dart-lang/sdk@e2a3f9a9d7 [vm/bytecode] Move bytecode metadata when creating a fresh component
dart-lang/sdk@f7b6169e18 Migration: add `required` keyword instead of `@required` annotation.
dart-lang/sdk@344b30e8ce Enable pedantic 1.8.0 in analyzer, analysis_server

DEPS

@@ -34,7 +34,7 @@ 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': '6c81690c3adad0aecb00cd1657ac9b2a3fb467e8',
+  'dart_revision': 'c6a14f4459c3a4b3d8b272e90baa38e0b9049550',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

-Signature: 962653711382f26bed93589a7fb0b856
+Signature: de770456f6daa4a940147edc4c284a6d
 
 UNUSED LICENSES: