Reviewed by Maciej.

        Trying to fix "DRT hangs on certain testcases" like fast/dom/Document/document-reopen.html
        document.open(); document.write(..); and NO document.close(). On the Qt platform this
        leaves a HTMLDocument which is still in parsing mode (parsing() always returns true).
        DRT waits forever, but m_frame->isComplete() is never true due the parsing mode problem.

        Hmpf, this took me nine hours to debug today.
        Result: Couldn't find the real fix, going for a workaround for now.
        
        540 minutes, 1 line of code changed after all -> 0,0019 lines per minute.

        * platform/qt/FrameQt.cpp:
        (WebCore::FrameQt::handledOnloadEvents): Call endIfNotLoading() manually.
        * platform/qt/FrameQtClient.cpp:
        (WebCore::FrameQtClientDefault::receivedData): Use write() again instead of addData().



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17020 268f45cc-cd09-0410-ab3c-d52691b4dbfc