Reviewed by Harrison.

    Reviewed by Harrison.

        - fixed <rdar://problem/4049776> Seed: Mail: Disable spellcheck leaves red artifacts

        * WebView.subproj/WebFrameInternal.h: Added _unmarkAllMisspellings.
        * WebView.subproj/WebFrame.m: (-[WebFrame _unmarkAllMisspellings]): Added.
        Calls unmarkAllMisspellings on the bridge and self and all subframes.

        * WebView.subproj/WebView.m: (-[WebView setContinuousSpellCheckingEnabled:]):
        Call _unmarkAllMisspellings on the main frame when turning continuous spell checking off.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8889 268f45cc-cd09-0410-ab3c-d52691b4dbfc