- fix build broken by my last checkin, the remaining code was not doing anything.

        * WebView/WebDataSource.m:
        * WebView/WebDataSourcePrivate.h:
        * WebView/WebFrame.m:
        (-[WebFrame _createPageCacheForItem:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12884 268f45cc-cd09-0410-ab3c-d52691b4dbfc