Let ShadowRoot.getElementById() fall back to DocumentFragment

ShadowRoot.getElementById() was added in 2012:
http://trac.webkit.org/changeset/106434

DocumentFragment.getElementById() was added in 2014:
https://codereview.chromium.org/251633002

The ShadowRoot override no longer serves any purpose. The argument
becomes non-optional with this change, which is Web-observable.

Review URL: https://codereview.chromium.org/799543002

git-svn-id: svn://svn.chromium.org/blink/trunk@187009 bbb929c8-8fbe-4397-9dbb-9b2b20218538
5 files changed
tree: 8376465c727bd8b5e5243d4743a4730d48081e21
  1. third_party/