Add support for threadsafe completion callback factory.

ppapi/proxy/ppb_file_system_proxy.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 PPAPI_PROXY_PPB_FILE_SYSTEM_PROXY_H_
 #define PPAPI_PROXY_PPB_FILE_SYSTEM_PROXY_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_time.h"
 #include "ppapi/c/ppb_file_system.h"
 #include "ppapi/proxy/interface_proxy.h"
-#include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
+#include "ppapi/proxy/proxy_completion_callback_factory.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace ppapi {
 
 class HostResource;
 
 namespace proxy {
 
 class PPB_FileSystem_Proxy : public InterfaceProxy {
  public:
@@ skipping 17 matching lines @@
                    ppapi::HostResource* result);
   void OnMsgOpen(const ppapi::HostResource& filesystem,
                  int64_t expected_size);
 
   void OnMsgOpenComplete(const ppapi::HostResource& filesystem,
                          int32_t result);
 
   void OpenCompleteInHost(int32_t result,
                           const ppapi::HostResource& host_resource);
 
-  pp::CompletionCallbackFactory<PPB_FileSystem_Proxy,
-                                ProxyNonThreadSafeRefCount> callback_factory_;
+  ProxyCompletionCallbackFactory<PPB_FileSystem_Proxy> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_FileSystem_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_FILE_SYSTEM_PROXY_H_