WebCore:

WebCore:

        Reviewed by Tristan.

        <rdar://problem/5250997> A crash occurs when selecting Undo Typing for a page that has been closed in tab

        * WebCore.exp: Added clearUndoRedoOperations.
        * page/Page.cpp:
        (WebCore::Page::clearUndoRedoOperations): Added.
        * page/Page.h:

WebKit:

        Reviewed by Tristan.

        <rdar://problem/5250997> A crash occurs when selecting Undo Typing for a page that has been closed in tab

        * WebView/WebView.mm:
        (-[WebView _clearUndoRedoOperations]): Added.
        * WebView/WebViewPrivate.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@22065 268f45cc-cd09-0410-ab3c-d52691b4dbfc