Roll src/third_party/dart 8b8a8f7b4e..fa74184b7a (1 commits)

fa74184b7a Verify that constructor initializers use only potentially constant expressions.

DEPS

@@ -31,7 +31,7 @@ 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': '8b8a8f7b4e11ceb0c4c9e504bfd5f3cbc496f74b',
+  'dart_revision': 'fa74184b7aad2a441a23c4c2f4160c09cc69ec32',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py