Fix up some parts in the implementation of QWebNetworkInterface
        so it can be used by plugins.
        Change the plugin API so we can actually get all the information
        required by the JS bridge from them as well.
        Implement the parts required for the JS bridge
        to know about the plugins.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@23468 268f45cc-cd09-0410-ab3c-d52691b4dbfc