Reviewed by Sam Weinig.

        Get rid of WebNetscapePlugInStreamLoaderClient, the plug-in stream is its own client.
        
        * Plugins/WebBaseNetscapePluginStream.h:
        * Plugins/WebBaseNetscapePluginStream.mm:
        (WebNetscapePluginStream::WebNetscapePluginStream):
        (-[WebBaseNetscapePluginStream dealloc]):
        (-[WebBaseNetscapePluginStream finalize]):
        * Plugins/WebBaseNetscapePluginView.mm:
        (-[WebBaseNetscapePluginView pluginView:receivedError:]):
        (-[WebBaseNetscapePluginView pluginViewFinishedLoading:]):
        (-[WebBaseNetscapePluginView evaluateJavaScriptPluginRequest:]):
        (-[WebBaseNetscapePluginView destroyStream:reason:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37913 268f45cc-cd09-0410-ab3c-d52691b4dbfc