Roll src/third_party/dart 69c6bea18f..e878bdafe9 (10 commits)

dart-lang/sdk@e878bdafe9 [vm/bytecode] Add DebugCheck to stop at return statement before executing finally blocks
dart-lang/sdk@6db6a0ce67 [vm/bytecode] Capture :controller_stream variable in async* functions
dart-lang/sdk@b6897ea094 Stop using resolutionMap in analyzer and analysis_server.
dart-lang/sdk@91de97f7e6 [nnbd_migration] Unwrap handles and remove handle assertion.
dart-lang/sdk@da4e6eb6e3 [vm/bytecode] Correct source positions for for-in statements
dart-lang/sdk@a7666c4fac Identifiers with ExtensionElement don't have types.
dart-lang/sdk@605709ac31 Fix _isDynamicExpression() in DartUnitHighlightsComputer2.
dart-lang/sdk@a2c7e7ce3e Migration: implement post-dominator analysis of `??` operations.
dart-lang/sdk@c1dbceda67 Migration: Test a complex example of flow analysis integration.
dart-lang/sdk@0c3a1a986f Migration: integrate flow analysis of try/catch/finally statements.

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': '69c6bea18ffdef2bb5dd31a0e6460be6d8ccf392',
+  'dart_revision': 'e878bdafe941be61a1422e018b86e85ed63fee70',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py