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akling@apple.com authored
<https://webkit.org/b/120276> Reviewed by Anders Carlsson. RenderLayer is always created with a renderer, so make renderer() (and m_renderer) references. Nuked an assortment of useless null checks. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154583 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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