Fix object element support so that fallback content works. With this change Safari...

	Fix object element support so that fallback content works.  With this change Safari passes the Acid2 test.

        Reviewed by Maciej

        * WebCoreSupport.subproj/WebBridge.m:
        (-[WebBridge determineObjectFromMIMEType:URL:]):
        * WebView.subproj/WebDataSource.m:
        (-[WebDataSource _receivedMainResourceError:complete:]):
        * WebView.subproj/WebMainResourceClient.m:
        (-[WebMainResourceClient continueAfterContentPolicy:response:]):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9094 268f45cc-cd09-0410-ab3c-d52691b4dbfc