Roll Dart SDK from bbe6bb982349 to ea7a92845c66 (1 revision) (flutter#19872)

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': 'bbe6bb9823495574917c75634b1f8a2a8099086c',
+  'dart_revision': 'ea7a92845c66b57294f7493b243f7b43004e9dea',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py