Reviewed by Adam.

    Reviewed by Adam.

        - removed a few includes from WebFrameLoader, fixed up as appropriate
        - segregated header includes into ones that need to go away to move the code and ones that don't

        * Loader/WebFrameLoader.m:
        (-[WebFrameLoader _privateBrowsingEnabled]):
        (-[WebFrameLoader willUseArchiveForRequest:originalURL:loader:]):
        * Loader/WebFrameLoaderClient.h:
        * WebView/WebFrame.m:
        (-[WebFrame _privateBrowsingEnabled]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@16903 268f45cc-cd09-0410-ab3c-d52691b4dbfc