Replace more ObserverList with base::ObserverList.

content/browser/renderer_host/pepper/browser_ppapi_host_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 
@@ skipping 120 matching lines @@
     BrowserPpapiHostImpl* browser_ppapi_host_impl_;
   };
 
   struct InstanceData {
     InstanceData(const PepperRendererInstanceData& renderer_data);
     ~InstanceData();
 
     PepperRendererInstanceData renderer_data;
     bool is_throttled;
 
-    ObserverList<InstanceObserver> observer_list;
+    base::ObserverList<InstanceObserver> observer_list;
   };
 
   // Reports plugin activity to the callback set with SetOnKeepaliveCallback.
   void OnKeepalive();
 
   scoped_ptr<ppapi::host::PpapiHost> ppapi_host_;
   base::Process plugin_process_;
   std::string plugin_name_;
   base::FilePath plugin_path_;
   base::FilePath profile_data_directory_;
@@ skipping 13 matching lines @@
   scoped_refptr<HostMessageFilter> message_filter_;
 
   BrowserPpapiHost::OnKeepaliveCallback on_keepalive_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPpapiHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_BROWSER_PPAPI_HOST_IMPL_H_