Roll Dart SDK from 1e0fec6e48cf to 494cd25b1d9a (12 revisions) (#24449)

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': '1e0fec6e48cf89f46973af38a5c2de4bc760a135',
+  'dart_revision': '494cd25b1d9a52bb5f4ea25e69ebfeaff91d03f9',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -239,7 +239,7 @@ deps = {
    Var('dart_git') + '/markdown.git@9c4beaac96d8f008078e00b027915f81b665d2de',
 
   'src/third_party/dart/third_party/pkg/matcher':
-   Var('dart_git') + '/matcher.git@43d5cac48fcd386643016e767164da87c5c25e29',
+   Var('dart_git') + '/matcher.git@1f7b6f0cb15eb6659a1de0513571575a5c8a51d0',
 
   'src/third_party/dart/third_party/pkg/mime':
    Var('dart_git') + '/mime.git@c931f4bed87221beaece356494b43731445ce7b8',

ci/licenses_golden/licenses_third_party

-Signature: c473d0d4c23fe01336bbbdab7fb8c5f7
+Signature: b6c6c4c5fe6dcea5a84ea1dbd1c64843
 
 UNUSED LICENSES: