[polymer.dart] fix *Changed observers inheriting

[polymer.dart] fix *Changed observers inheriting.

R=sigmund@google.com

Committed: https://code.google.com/p/dart/source/detail?r=30561

[Jennifer Messerly, 2013-11-21 00:07:34]

https://codereview.chromium.org/79353003/diff/1/pkg/polymer/lib/src/declarati...
File pkg/polymer/lib/src/declaration.dart (left):

https://codereview.chromium.org/79353003/diff/1/pkg/polymer/lib/src/declarati...
pkg/polymer/lib/src/declaration.dart:518: for (var getter in
cls.declarations.values) {
with .declarations, we don't need this duplication

[Siggi Cherem (dart-lang), 2013-11-21 01:42:40]

I believe this will also fix if you have an event listener in the base class.
Would you mind adding a test for that too?

otherwise, lgtm

[Jennifer Messerly, 2013-11-21 01:44:51]

good call. yes, the idea is to fix event listeners too :)

[Jennifer Messerly, 2013-11-22 03:04:36]

Committed patchset #4 manually as r30561 (presubmit successful).