Reviewed by Kevin Decker.

        - added an assertion for a situation that leads to a Safari assertion:
          a commit that is not followed by a load completion

        - removed some unneeded FrameLoader stuff -- maybe some day we'll get this
          class cut down to size

        * loader/FrameLoader.cpp:
        (WebCore::FrameLoader::FrameLoader): Added boolean for assertion.
        (WebCore::FrameLoader::checkLoadCompleteForThisFrame): Added code to assert
        that we already sent a commit before sending a complete.
        (WebCore::FrameLoader::continueFragmentScrollAfterNavigationPolicy): Call
        client directly instead of indirecting through a function.
        (WebCore::FrameLoader::loadItem): Ditto.
        (WebCore::FrameLoader::goToItem): Ditto.
        (WebCore::FrameLoader::addHistoryForCurrentLocation): Get the private browsing
        state from Settings instead of FrameLoaderClient. Also call client directly
        instead of indirecting through a function.
        (WebCore::FrameLoader::updateHistoryForReload): Call client directly instead
        of indirecting through a function.
        (WebCore::FrameLoader::dispatchDidCommitLoad): Added code to assert
        that we did not yet send a commit and set the flag that will be used to check
        that we don't do this twice in a row without an intervening completion call.

        * loader/FrameLoader.h: Added a boolean for the assertion. Removed six
        now-unneeded functions.

        * loader/FrameLoaderClient.h: Removed now-unneeded privateBrowsingEnabled function.

        * loader/ResourceLoader.cpp: (WebCore::ResourceLoader::willCacheResponse): Get
        the private browsing state from Settings instead of FrameLoaderClient.

        * svg/graphics/SVGImageEmptyClients.h: Removed obsolete privateBrowsingEnabled.

WebKit/gtk:

        Reviewed by Kevin Decker.

        * WebCoreSupport/FrameLoaderClientGtk.cpp: Removed obsolete privateBrowsingEnabled.
        * WebCoreSupport/FrameLoaderClientGtk.h: Ditto.

WebKit/mac:

        Reviewed by Kevin Decker.

        * WebCoreSupport/WebFrameLoaderClient.h: Removed obsolete privateBrowsingEnabled.
        * WebCoreSupport/WebFrameLoaderClient.mm: Ditto.
        * WebKit.order: Ditto.

WebKit/qt:

        Reviewed by Kevin Decker.

        * WebCoreSupport/FrameLoaderClientQt.cpp: Removed obsolete privateBrowsingEnabled.
        * WebCoreSupport/FrameLoaderClientQt.h: Ditto.

WebKit/win:

        Reviewed by Kevin Decker.

        * WebFrame.cpp: Removed obsolete privateBrowsingEnabled.
        * WebFrame.h: Ditto.

WebKit/wx:

        Reviewed by Kevin Decker.

        * WebKitSupport/FrameLoaderClientWx.cpp: Removed obsolete privateBrowsingEnabled.
        * WebKitSupport/FrameLoaderClientWx.h: Ditto.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@28399 268f45cc-cd09-0410-ab3c-d52691b4dbfc