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akling@apple.com authored
<https://webkit.org/b/121151> Reviewed by Anders Carlsson. There is always a BackForwardController, so make backForward() return a reference. Also made it store a Page& internally since it's tied to the lifetime of Page. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155529 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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