- fix <rdar://problem/6607773> WebKit should support the "Default"
          paragraph writing direction -- or at least validate the menu item
          appropriately

        Made WebHTMLView validate user interface items with the selector
        -makeBaseWritingDirectionNatural: by returning NO and, if the item is
        a menu item, setting its state to "off".

        Strictly speaking, since -makeBaseWritingDirectionNatural: is never
        valid for WebViews, WebHTMLView should not need to respond to it and
        validate it, however because other responders respond to all three
        -makeBaseWritingDirection*: messages and set the menu item state, having
        WebHTMLView do the same makes application developers' lives easier.

        * WebView/WebHTMLView.mm:
        (-[WebHTMLView validateUserInterfaceItemWithoutDelegate:]):
        (-[WebHTMLView makeBaseWritingDirectionNatural:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41712 268f45cc-cd09-0410-ab3c-d52691b4dbfc