Add IPC message to open chrome://plugins from a missing plug-in placeholder.

chrome/renderer/plugins/blocked_plugin.h

 // 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.
 
 #ifndef CHROME_RENDERER_PLUGINS_BLOCKED_PLUGIN_H_
 #define CHROME_RENDERER_PLUGINS_BLOCKED_PLUGIN_H_
 #pragma once
 
 #include "chrome/renderer/plugins/plugin_placeholder.h"
 #include "webkit/plugins/webplugininfo.h"
@@ skipping 41 matching lines @@
 
   // Javascript callbacks:
   // Load the blocked plugin by calling LoadPlugin().
   // Takes no arguments, and returns nothing.
   void LoadCallback(const CppArgumentList& args, CppVariant* result);
 
   // Hide the blocked plugin by calling HidePlugin().
   // Takes no arguments, and returns nothing.
   void HideCallback(const CppArgumentList& args, CppVariant* result);
 
-  // Opens a URL in a new tab.
-  // Takes one argument, a string specifying the URL to open. Returns nothing.
-  void OpenUrlCallback(const CppArgumentList& args, CppVariant* result);
+  // Opens chrome://plugins in a new tab.
+  // Takes no arguments, and returns nothing.
+  void OpenAboutPluginsCallback(const CppArgumentList& args,
+                                CppVariant* result);
 
   // Load the blocked plugin.
   void LoadPlugin();
 
   // Hide the blocked plugin.
   void HidePlugin();
 
   webkit::WebPluginInfo plugin_info_;
   // The name of the plugin that was blocked.
   string16 name_;
   // True iff the plugin was blocked because the page was being prerendered.
   // Plugin will automatically be loaded when the page is displayed.
   bool is_blocked_for_prerendering_;
   bool hidden_;
   bool allow_loading_;
 };
 
 #endif  // CHROME_RENDERER_PLUGINS_BLOCKED_PLUGIN_H_