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akling@apple.com authored
<http://webkit.org/b/119677> Reviewed by Antti Koivisto. Page always creates the main Frame by itself now, so it will never be null during the Page's lifetime. Let Page::mainFrame() return Frame& and remove a sea of null checks. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154658 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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