Remove unneeded uses of base/ref_counted.h.

webkit/glue/plugins/plugin_list.h

 // Copyright (c) 2006-2008 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 WEBKIT_GLUE_PLUGIN_PLUGIN_LIST_H__
 #define WEBKIT_GLUE_PLUGIN_PLUGIN_LIST_H__
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
-#include "base/ref_counted.h"
 #include "webkit/glue/webplugin.h"
 #include "webkit/glue/plugins/nphostapi.h"
 
 class GURL;
 
 namespace base {
 
 template <typename T>
 struct DefaultLazyInstanceTraits;
 
@@ skipping 193 matching lines @@
   std::vector<PluginVersionInfo> internal_plugins_;
 
   friend struct base::DefaultLazyInstanceTraits<PluginList>;
 
   DISALLOW_EVIL_CONSTRUCTORS(PluginList);
 };
 
 } // namespace NPAPI
 
 #endif  // WEBKIT_GLUE_PLUGIN_PLUGIN_LIST_H__