Roll Dart SDK from a325ab04ed38 to fa724490f430 (1 revision) (flutter#27825)

Author: skia-flutter-autoroll

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': 'a325ab04ed38bba339d4b775d223a8fde2757593',
+  'dart_revision': 'fa724490f4301ba27e3668a0c16924f05169c45b',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py