commit a11083ff7faf617528ea2fc9a1e08d35b68d8932
author akling@apple.com <akling@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> Thu Oct 17 12:15:36 2013 +0000
committer akling@apple.com <akling@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> Thu Oct 17 12:15:36 2013 +0000
tree a98cb248157cb2daf4fc5dc3c6cc8d7cafaf3d8f
parent be79cf1e39f31462e31c2d7eb743256189336ad3

DataRef<T> should use Ref<T> internally.
<https://webkit.org/b/122953>

DataRef is used to hold RenderStyle substructures, and due to the
way style inheritance is implemented, DataRef will always point to
a live object.

Codify this by making DataRef::m_data a Ref, and making all methods
that create substructure objects return PassRef.

Reviewed by Antti Koivisto.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157568 268f45cc-cd09-0410-ab3c-d52691b4dbfc