Revert Dart SDK to 1e0fec6e48cf89f46973af38a5c2de4bc760a135 (#24436)

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': '4db0f5599c85e5bf060e6a851997789e09a63718',
+  'dart_revision': '1e0fec6e48cf89f46973af38a5c2de4bc760a135',
 
   # 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@1f7b6f0cb15eb6659a1de0513571575a5c8a51d0',
+   Var('dart_git') + '/matcher.git@43d5cac48fcd386643016e767164da87c5c25e29',
 
   'src/third_party/dart/third_party/pkg/mime':
    Var('dart_git') + '/mime.git@c931f4bed87221beaece356494b43731445ce7b8',
@@ -504,7 +504,7 @@ deps = {
     'packages': [
       {
         'package': 'fuchsia/third_party/clang/mac-amd64',
-        'version': 'hoapl8VNWFGkiCI_tQDt_7wKgyaxie5bw_plTjO00T0C' 
+        'version': 'hoapl8VNWFGkiCI_tQDt_7wKgyaxie5bw_plTjO00T0C'
       }
     ],
     'condition': 'host_os == "mac"',

ci/licenses_golden/licenses_third_party

-Signature: f04a2248d0d4d053ac374d32b73047d5
+Signature: c473d0d4c23fe01336bbbdab7fb8c5f7
 
 UNUSED LICENSES: