Roll Dart SDK from d551980ac9fc to ecce58c1e354 (2 revisions) (#18556)

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': 'd551980ac9fceeac6fded2572d001eb4c9b4e406',
+  'dart_revision': 'ecce58c1e3541527be0bf0669ff057b2b2313c81',
 
   # 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

-Signature: b11f017bc26d0ad5a7dd55c8fcc98b2a
+Signature: 3115a6577d68df2062c434009ca809df
 
 UNUSED LICENSES: