Roll Dart SDK from 27d9970dfeb1 to c835079edda4 (2 revisions) (#21160)

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': '27d9970dfeb1ef6032d661d76bc36127de70de5a',
+  'dart_revision': 'c835079edda4342312083e3418781bc446affb88',
 
   # 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: bd077043d120f34927a8743c1b6a9c43
+Signature: 6733ca34c4a4eefc78df9d5bdfc19df3
 
 UNUSED LICENSES: