Roll Dart SDK from 249cb9c974e1 to 403955cf347f (9 revisions) (#18854)

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': '249cb9c974e13177fe5f76b390e2569ece79185f',
+  'dart_revision': '403955cf347f46f006c45f1eca7b696433fed642',
 
   # 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: a64a09a5666bcde41231353950203274
+Signature: 05b8dd39e50df89f37841d26e7204190
 
 UNUSED LICENSES: