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        Reviewed by Darin Adler.

        https://bugs.webkit.org/show_bug.cgi?id=25136
        CRASH in DocumentLoader::removeSubresourceLoader due to null m_frame

        Test: fast/frames/frame-unload-crash.html

        * loader/DocumentLoader.cpp:
        (WebCore::DocumentLoader::updateLoading): Added null check of m_frame.



git-svn-id: svn://svn.chromium.org/blink/trunk@42442 bbb929c8-8fbe-4397-9dbb-9b2b20218538