Roll src/third_party/dart 5701c4fd3b11..57462f9ca520 (7 commits) (#16922)

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': '5701c4fd3b11b4dbb1e7a3e9f6b1cc319ca5f1ac',
+  'dart_revision': '57462f9ca52000932d2ac82613808131650b440c',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py