Moved the following IPC messages used by the chrome NPAPI plugin installer out of content

content/plugin/webplugin_proxy.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/plugin/webplugin_proxy.h"
 
 #include "build/build_config.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_handle.h"
@@ skipping 236 matching lines @@
 
 std::string WebPluginProxy::GetCookies(const GURL& url,
                                        const GURL& first_party_for_cookies) {
   std::string cookies;
   Send(new PluginHostMsg_GetCookies(route_id_, url,
                                     first_party_for_cookies, &cookies));
 
   return cookies;
 }
 
-void WebPluginProxy::OnMissingPluginStatus(int status) {
-  Send(new PluginHostMsg_MissingPluginStatus(route_id_, status));
-}
-
 WebPluginResourceClient* WebPluginProxy::GetResourceClient(int id) {
   ResourceClientMap::iterator iterator = resource_clients_.find(id);
   // The IPC messages which deal with streams are now asynchronous. It is
   // now possible to receive stream messages from the renderer for streams
   // which may have been cancelled by the plugin.
   if (iterator == resource_clients_.end()) {
     return NULL;
   }
 
   return iterator->second;
@@ skipping 467 matching lines @@
       resource_clients_.erase(index++);
     } else {
       index++;
     }
   }
 }
 
 void WebPluginProxy::URLRedirectResponse(bool allow, int resource_id) {
   Send(new PluginHostMsg_URLRedirectResponse(route_id_, allow, resource_id));
 }