Add support for threadsafe completion callback factory.

ppapi/proxy/ppb_file_chooser_proxy.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 PPAPI_PROXY_PPB_FILE_CHOOSER_PROXY_H_
 #define PPAPI_PROXY_PPB_FILE_CHOOSER_PROXY_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/interface_proxy.h"
 #include "ppapi/proxy/proxy_array_output.h"
-#include "ppapi/proxy/proxy_non_thread_safe_ref_count.h"
+#include "ppapi/proxy/proxy_completion_callback_factory.h"
 #include "ppapi/proxy/serialized_var.h"
 #include "ppapi/thunk/ppb_file_chooser_api.h"
 #include "ppapi/cpp/output_traits.h"
 #include "ppapi/utility/completion_callback_factory.h"
 
 namespace ppapi {
 
 class HostResource;
 struct PPB_FileRef_CreateInfo;
 
@@ skipping 31 matching lines @@
       int32_t result_code,
       const std::vector<PPB_FileRef_CreateInfo>& chosen_files);
 
   // Called when the show is complete in the host. This will notify the plugin
   // via IPC and OnMsgChooseComplete will be called there.
   void OnShowCallback(
       int32_t result,
       scoped_refptr<RefCountedArrayOutputAdapter<PP_Resource> > output,
       HostResource chooser);
 
-  pp::CompletionCallbackFactory<PPB_FileChooser_Proxy,
-                                ProxyNonThreadSafeRefCount> callback_factory_;
+  ProxyCompletionCallbackFactory<PPB_FileChooser_Proxy> callback_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_FileChooser_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_FILE_CHOOSER_PROXY_H_