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akling@apple.com authored
<https://webkit.org/b/121627> Reviewed by Antti Koivisto. Add a RenderObject::nodeForNonAnonymous() that can be used instead of node() when a renderer is guaranteed non-anonymous. Use this to implement reference element getters for the various renderers that are known at compile-time to correspond to a DOM node. Also renamed existingElement() => element() since using an alternate name for a reference overload isn't actually necessary. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156155 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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