Roll Dart SDK from 4c4bf41 to 0507607 (1 revision)

https://dart.googlesource.com/sdk.git/+log/4c4bf41da092..0507607e1380

2021-08-25 [email protected] Version 2.15.0-52.0.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 [email protected],[email protected] 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

@@ -39,7 +39,7 @@ 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': '4c4bf41da09210cd8fb404006a97b2103923d48f',
+  'dart_revision': '0507607e13808426fb90fd0b4a5e751a3fe7e029',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -49,7 +49,6 @@ vars = {
   'dart_clock_rev': 'a494269254ba978e7ef8f192c5f7fec3fc05b9d3',
   'dart_collection_rev': '75a7a5510979a3cd70143af85bcc1667ee233674',
   'dart_devtools_rev': '2b47d9ed486479153ca2fd038000950674ed1beb',
-  'dart_http_throttle_tag': '1.0.2',
   'dart_intl_tag': '0.17.0-nullsafety',
   'dart_linter_tag': '1.9.0',
   'dart_protobuf_rev': 'c1eb6cb51af39ccbaa1a8e19349546586a5c8e31',
@@ -236,9 +235,6 @@ deps = {
   'src/third_party/dart/third_party/pkg/http_parser':
    Var('dart_git') + '/http_parser.git@202391286ddc13c4c3c284ac5b511f04697250ed',
 
-  'src/third_party/dart/third_party/pkg/http_throttle':
-   Var('dart_git') + '/http_throttle.git' + '@' + Var('dart_http_throttle_tag'),
-
   'src/third_party/dart/third_party/pkg/intl':
    Var('dart_git') + '/intl.git' + '@' + Var('dart_intl_tag'),
 

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: db68378fca15712b4a02dc80c68c9bf9
+Signature: e1c995f2932d929d29c9b532125f8196
 
 UNUSED LICENSES: