Roll Dart SDK from df05e451b79a to 50b96abe9f6f (1 revision)

https://dart.googlesource.com/sdk.git/+log/df05e451b79a..50b96abe9f6f

2023-04-20 dart-internal-merge@dart-ci-internal.iam.gserviceaccount.com Version 3.1.0-26.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC aam@google.com,chinmaygarde@google.com,dart-vm-team@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter Engine: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Author: skia-flutter-autoroll

DEPS

@@ -47,7 +47,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': 'df05e451b79a5c3d77257d32c64560c379758000',
+  'dart_revision': '50b96abe9f6f132110a4fbe4d49590b8f4f31651',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -487,7 +487,7 @@ deps = {
    Var('dart_git') + '/yaml_edit.git' + '@' + Var('dart_yaml_edit_rev'),
 
   'src/third_party/dart/tools/sdks':
-   {'packages': [{'version': 'version:3.0.0-369.0.dev', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
+   {'packages': [{'version': 'version:3.0.0-417.2.beta', 'package': 'dart/dart-sdk/${{platform}}'}], 'dep_type': 'cipd'},
 
   # WARNING: end of dart dependencies list that is cleaned up automatically - see create_updated_flutter_deps.py.
 

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 8cd6a344c98173457757f14db69e8f1f
+Signature: 1377370be3708898d4f3d92157ffc1e6
 
 ====================================================================================================
 LIBRARY: angle