<rdar://problem/4770453> VO not honoring secure edit fields in web pages

        The remaining problem was the password fields would return their contents
        even though they did not advertise that they could. Apparently, VoiceOver
        does not read the ads.

        * bridge/mac/WebCoreAXObject.mm:
        (isPasswordFieldElement):
        (-[WebCoreAXObject isPasswordField]):
        (-[WebCoreAXObject textMarkerForVisiblePosition:]):
        (-[WebCoreAXObject accessibilityAttributeValue:]):
        (-[WebCoreAXObject doAXStringForRange:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@17784 268f45cc-cd09-0410-ab3c-d52691b4dbfc