Reviewed by Sam Weinig.

        * Add FrameLoader::shouldTreatSchemeAsLocal which is similar to
        shouldTreatURLAsLocal.
        * Make use of FrameLoader::shouldTreatSchemeAsLocal in SecurityOrigin
        and do not hardcode "file". This is needed for the WebKit/qt port to make
        the Web Inspector work as it using the qrc protocol instead of file.

        * loader/FrameLoader.cpp:
        (WebCore::FrameLoader::shouldTreatSchemeAsLocal):
        * loader/FrameLoader.h:
        * platform/SecurityOrigin.cpp:
        (WebCore::SecurityOrigin::isSecureTransitionTo):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@28343 268f45cc-cd09-0410-ab3c-d52691b4dbfc