Reviewed by Eric Carlson.

        HTMLMediaElement crash when it is used after resource loading is canceled.
        https://bugs.webkit.org/show_bug.cgi?id=35992

        Adding a test to access the duration property of a video element after
        resource loading was canceled.

        * http/tests/media/video-cancel-load-expected.txt: Added.
        * http/tests/media/video-cancel-load.html: Added.
2010-03-12  Alpha Lam  <hclam@chromium.org>

        Reviewed by Eric Carlson.

        Fix a crash when resource loading of media element is canceled.
        https://bugs.webkit.org/show_bug.cgi?id=35992

        Use of HTMLMediaElement::duration() after resource loading was canceled
        will cause a crash. This is because HTMLMediaElement::m_player is used
        when NULL.
        Test: http/tests/media/video-cancel-load.html

        * html/HTMLMediaElement.cpp:
        (WebCore::HTMLMediaElement::duration):
        Avoid calling to m_player when it is null.
        (WebCore::HTMLMediaElement::userCancelledLoad):
        Set m_readyState to HAVE_NOTHING.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55917 268f45cc-cd09-0410-ab3c-d52691b4dbfc