Reviewed by Darin.

        <rdar://problem/4900071>
        http://bugs.webkit.org/show_bug.cgi?id=6454
        ASSERTION: Navigating 'back' in frameset: !_private->previousItem (6454)

        * fast/frames/frame-navigation.html: Added.
        * fast/frames/resources/frame-navigation-child.html: Added.

WebCore:

        Reviewed by Darin.

        <rdar://problem/4900071>
        http://bugs.webkit.org/show_bug.cgi?id=6454
        ASSERTION: Navigating 'back' in frameset: !_private->previousItem (6454)

        Change back the behavior of checkLoadComplete to traverse the entire frame tree instead of
        just the parent frames of the current frame. This is needed in order to reset the previous history item
        for all frames when doing a frame navigation. (This was changed in revision 11819)
        
        * loader/FrameLoader.cpp:
        (WebCore::FrameLoader::recursiveCheckLoadComplete):
        (WebCore::FrameLoader::checkLoadComplete):
        * loader/FrameLoader.h:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@20132 268f45cc-cd09-0410-ab3c-d52691b4dbfc