Roll src/third_party/dart 8ab978b6d4..beee442625 (17 commits)

dart-lang/sdk@beee442625 [vm/bytecode] Switch kernel service dill to bytecode if building Dart SDK with --bytecode
dart-lang/sdk@7c3ea0af6a Handle non-null iterable types in for ins
dart-lang/sdk@29dc9313e6 [dartdevc] Create a new status file for DDC co19 tests
dart-lang/sdk@6728a9f515 [vm] Add more descriptive error messages to VM unit tests
dart-lang/sdk@221ebec08d Fix catchError callback example; dartfmt
dart-lang/sdk@14e84afb63 Flow analysis: fix incorrect comment
dart-lang/sdk@f62531fe9e Migration: integrate flow analysis of while loops and break statements.
dart-lang/sdk@d635e3db83 Flow analysis: expose FlowAnalysisHelper.getLabelTarget.
dart-lang/sdk@106901cb59 Flow analysis: extract a method for computing assigned variables.
dart-lang/sdk@e08902e476 Migration: integrate conditional expression handling with flow analysis.
dart-lang/sdk@0477f8df9e Fix keyword infinite loop
dart-lang/sdk@b40b301564 Add more extension completion tests and fix a bug they uncovered
dart-lang/sdk@eae781c73e [cfe] Add Field.isLate, VariableDeclaration.isLate and VariableDeclaration.isRequired
dart-lang/sdk@b4b1d5ddac [vm/bytecode] Avoid eagerly reading all bytecode in app-jit snapshots
dart-lang/sdk@1644d4b178 [vm/bytecode] Train kernel service with bytecode generation
dart-lang/sdk@b2b74e6312 [vm/bytecode] Restore source positions removed by mistake in previous CL.
dart-lang/sdk@19a0c3902b Fix LibraryElement.nameLength value.

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': '8ab978b6d4f165aeb5c0b7655115adfe878309fa',
+  'dart_revision': 'beee442625935de723412c386961285467db4436',
 
   # 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: 7fc580d4451fdc76fd95cabf9d7d02a7
+Signature: 412f3661202173d258bd41c811ce1355
 
 UNUSED LICENSES: