3143294 - need short-term bulletproofing of download code against bad filenames

	We protect against a download location that is not an absolute path.

        Reviewed by Darin

        * WebView.subproj/WebMainResourceClient.m:
        (-[WebMainResourceClient continueAfterContentPolicy:response:]):
	Bail on download if we don't have a abs path to write to.

WebBrowser:

	3143294 - need short-term bulletproofing of download code against bad filenames

	We protect against slashes and leading periods, as well as handling empty filenames.

        Reviewed by Darin

        * BrowserWebController.m:
        (-[BrowserWebController saveFilenameForResponse:andRequest:]):
	Check results of [response filename] carefully


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@3287 268f45cc-cd09-0410-ab3c-d52691b4dbfc