Reviewed by Brady.

        - http://bugs.webkit.org/show_bug.cgi?id=13564
          Remove friend class FrameLoader from Frame

        No test added since there is no change in functionality.

        * loader/FrameLoader.cpp:
        (WebCore::FrameLoader::didOpenURL):
        (WebCore::FrameLoader::begin):
        (WebCore::FrameLoader::open):
        * loader/FrameLoader.h: Made clear() private.
        * page/Frame.cpp:
        (WebCore::Frame::setDocument): Changed the argument into a PassRefPtr.
        * page/Frame.h:
        * xml/XSLTProcessor.cpp:
        (WebCore::XSLTProcessor::createDocumentFromSource):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21219 268f45cc-cd09-0410-ab3c-d52691b4dbfc