Roll src/third_party/dart f0da03ca36..bc99f1ca28 (1 commits)

bc99f1ca28 Test a few more uses of the nullable type decorator

DEPS

@@ -31,7 +31,7 @@ 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': 'f0da03ca367b15bf132b259acac42ed658f7b70d',
+  'dart_revision': 'bc99f1ca2819c67a5260929b03c3d7ed24943b58',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py