Roll Dart SDK from 1e78bd0 to ab958be (7 revisions) (#19799)

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': '1e78bd069ee704e8590655e6e5ea4e938fcc1ca9',
+  'dart_revision': 'ab958bee577be63dab157ce264db8f7cc4b02ab9',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py

ci/licenses_golden/licenses_third_party

@@ -1,4 +1,4 @@
-Signature: 1c3458f5a9538545a03415ac53c4f227
+Signature: 95ae9578c50cccc1359eb86d0bfe3552
 
 UNUSED LICENSES:
 
@@ -8745,7 +8745,6 @@ FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_array.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_number.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/js_string.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/math_patch.dart
-FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/mirrors_patch_cfe.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/native_helper.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/regexp_helper.dart
 FILE: ../../../third_party/dart/sdk/lib/_internal/js_runtime/lib/string_helper.dart