"Reverting 30388"

"Reverting 30388"
This is a new TodoMVC based on Polymer's version, now fixed on IE. Also fixes two other bugs in how we were handling styles:
* scoped styles were broken unless browser supported them natively
* link rel=stylesheet for external styles was broken

(restore) https://code.google.com/p/dart/source/detail?r=30387
(revert) https://code.google.com/p/dart/source/detail?r=30388

R=sigmund@google.com

Committed: https://code.google.com/p/dart/source/detail?r=30554

[Jennifer Messerly, 2013-11-20 22:53:44]

Please take a look. I uploaded the already-reviewed changes in patch set 1,
patch set 2 has the IE fixes and patch set 3 has a test tweak.

[Siggi Cherem (dart-lang), 2013-11-21 01:46:13]

lgtm!

https://codereview.chromium.org/77373002/diff/160001/pkg/polymer/lib/src/decl...
File pkg/polymer/lib/src/declaration.dart (right):

https://codereview.chromium.org/77373002/diff/160001/pkg/polymer/lib/src/decl...
pkg/polymer/lib/src/declaration.dart:557: if
(!js.context.hasProperty('ShadowDOMPolyfill')) return;
! o u c h

[Jennifer Messerly, 2013-11-21 23:11:16]

Committed patchset #3 manually as r30554 (presubmit successful).