Roll src/third_party/dart 5ba6fb73ec..5e44c0b016 (11 commits)

dart-lang/sdk@5e44c0b016 [test tool] Enable dart:mirrors support on vm-dartkb-*-simarm64 bots
dart-lang/sdk@70b1cedd87 Use NNBD subtyping rules.
dart-lang/sdk@d6efa87f1f Remove an unused variable
dart-lang/sdk@9910fa8454 [cfe] Implement the first part of NNBD-aware isSubtypeOf
dart-lang/sdk@e62c7ae3bb [infra] Add legacy AST mode builder to the test-matrix.json
dart-lang/sdk@6700ed4ac5 Merge _FunctionTypeImplStrict into FunctionTypeImpl.
dart-lang/sdk@01f1218c3c Remove ExecutableElementImpl.declaredReturnType
dart-lang/sdk@80b0aaf9b8 Deprecate FunctionTypeAliasElement.instantiate2(), replace with instantiate().
dart-lang/sdk@2b23d8d327 Remove CircularTypeImpl.
dart-lang/sdk@c533ba029b Remove ClassElementImpl.version and flushing InterfaceTypeImpl.
dart-lang/sdk@0167f91012 Flow analysis: introduce ID tests for AssignedVariables.

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': '5ba6fb73eccc6ca9c4cce05dc0ed8a9d69268ae7',
+  'dart_revision': '5e44c0b0164bafc8de68b04580cafe3dc19050ea',
 
   # 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: 50db5fe4aff6079f152dca8009a48306
+Signature: 27f447bd095f2ed30fc73f1cfb97f552
 
 UNUSED LICENSES: