Roll Dart SDK from d31a6683999e to f142aa958951 (2 revisions) (#25268)

DEPS

@@ -35,7 +35,7 @@ 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': 'd31a6683999e82e992aeab283e5165df51edf2c3',
+  'dart_revision': 'f142aa958951f70333f51eab05a8d3950fabce14',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -301,9 +301,6 @@ deps = {
   'src/third_party/dart/third_party/pkg/stack_trace':
    Var('dart_git') + '/stack_trace.git' + '@' + Var('dart_stack_trace_tag'),
 
-  'src/third_party/dart/third_party/pkg/stagehand':
-   Var('dart_git') + '/stagehand.git@e64ac90cac508981011299c4ceb819149e71f1bd',
-
   'src/third_party/dart/third_party/pkg/stream_channel':
    Var('dart_git') + '/stream_channel.git' + '@' + Var('dart_stream_channel_tag'),
 

ci/licenses_golden/licenses_third_party

-Signature: 00dc5dc6e965157b5e87954e55986281
+Signature: 897d6db5de799e1ffbe5508b070590c6
 
 UNUSED LICENSES: