RenderElement::style() should return a reference.
<https://webkit.org/b/123414> Now that renderers always have style, go ahead and make style() return a RenderStyle&. There are countless opportunities for further cleanup enabled by this change. I'm simply passing &style() in many cases where we can really do something nicer instead. Reviewed by Anders Carlsson. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158163 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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