FocusController::focusedOrMainFrame() should return a reference.
<https://webkit.org/b/120339> Reviewed by Antti Koivisto. Now that Page::mainFrame() returns a reference, we can make this return a reference too, since there's always either a focused or a main frame. One hectogram of null checks removed as a result. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154678 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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