Roll Dart SDK from abdfa80162c1 to 279a4b920da8 (1 revision) (flutter#20463)

Author: skia-flutter-autoroll

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': 'abdfa80162c196c61f17272e59e44325f43aae89',
+  'dart_revision': '279a4b920da82780f57925902fe6284630b21437',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -57,7 +57,6 @@ vars = {
   'dart_shelf_packages_handler_tag': '2.0.0',
   'dart_shelf_proxy_tag': '0.1.0+7',
   'dart_shelf_static_rev': 'v0.2.8',
-  'dart_shelf_tag': '0.7.3+3',
   'dart_shelf_web_socket_tag': '0.2.2+3',
   'dart_sse_tag': 'e5cf68975e8e87171a3dc297577aa073454a91dc',
   'dart_stack_trace_tag': 'd3813ca0a77348e0faf0d6af0cc17913e36afa39',
@@ -278,7 +277,7 @@ deps = {
    Var('dart_git') + '/resource.git' + '@' + Var('dart_resource_rev'),
 
   'src/third_party/dart/third_party/pkg/shelf':
-   Var('dart_git') + '/shelf.git' + '@' + Var('dart_shelf_tag'),
+   Var('dart_git') + '/shelf.git@289309adc6c39aab0a63db676d550c517fc1cc2d',
 
   'src/third_party/dart/third_party/pkg/shelf_packages_handler':
    Var('dart_git') + '/shelf_packages_handler.git' + '@' + Var('dart_shelf_packages_handler_tag'),

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: a9e2dc6b9d60cae277da92e2b1f26e80
+Signature: de26dea324a0c388b12c6d4224222be4
 
 UNUSED LICENSES: