Roll src/third_party/dart 06509e3..9aea1f3 (8 commits)

dart-lang/sdk@9aea1f3489 [dart2js] Eliminate redundant function kind checks.
dart-lang/sdk@62aa02e716 [dart/vm] Fix type of loop variable to int
dart-lang/sdk@09bee6ce12 Remove unused import
dart-lang/sdk@b0968395f1 [vm/compiler] Minor heuristic change to reduce code size
dart-lang/sdk@762f049479 [dart2js] new-rti: fix merge problem
dart-lang/sdk@e94fed95e2 Extract DuplicateDefinitionVerifier.
dart-lang/sdk@998deea338 [nnbd_migration] Handle while loops.
dart-lang/sdk@576ef913e4 [dart2js] new-rti: lower field setters

Author: bkonyi

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': '06509e333deb74572f002a32af17043795b0988c',
+  'dart_revision': '9aea1f3489e2fce0efab6121f3060c8ce890ae89',
 
   # 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

@@ -1,4 +1,4 @@
-Signature: 8d8356005da83fd5713696ac4854427f
+Signature: 14ecb78fd1d5eb2f001a2e055c85ac94
 
 UNUSED LICENSES: