Roll Dart SDK from 8c085176125f to e4c9b06267d3 (2 revisions) (#22992)

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': '8c085176125f8be61f92045ae75652883657f070',
+  'dart_revision': 'e4c9b06267d32507ead537df60d5b17d1a1dcca6',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -180,7 +180,7 @@ deps = {
    Var('dart_git') + '/collection.git' + '@' + Var('dart_collection_rev'),
 
   'src/third_party/dart/third_party/pkg/convert':
-   Var('dart_git') + '/convert.git@dd3bd28f63be7cb8ab961f38bc73229e4473b555',
+   Var('dart_git') + '/convert.git@6513985a1b1ea8a0b987fbef699250ce2cdc3cca',
 
   'src/third_party/dart/third_party/pkg/crypto':
    Var('dart_git') + '/crypto.git@a5ec902dda5a635a35c6b363ec64458cf84c5872',

ci/licenses_golden/licenses_third_party

-Signature: 01e2e5e87122d4bfe59470f7858ef958
+Signature: def638709f28af418bf9bc2ff2b860bc
 
 UNUSED LICENSES: