FrameLoader::history() should return a reference.
<https://webkit.org/b/120163> Reviewed by Anders Carlsson. Rehued by Anders Carlsson. FrameLoader::m_history is never null, so make history() return a reference. Also made HistoryController::m_frame a reference, since HistoryController's lifetime is tied to FrameLoader, which is tied to the Frame. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154458 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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