Let IPC::SyncMessageFilter take advantage of thread-safe Send.

ppapi/nacl_irt/manifest_service.h

 // Copyright 2014 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_NACL_IRT_MANIFEST_SERVICE_H_
 #define PPAPI_NACL_IRT_MANIFEST_SERVICE_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class WaitableEvent;
 }  // namespace base
 
 namespace IPC {
 struct ChannelHandle;
-class ChannelProxy;
+class SyncChannel;
 class SyncMessageFilter;
 }  // namespace IPC
 
 namespace ppapi {
 
 class ManifestService {
  public:
   ManifestService(const IPC::ChannelHandle& handle,
                   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
                   base::WaitableEvent* shutdown_event);
   ~ManifestService();
 
   void StartupInitializationComplete();
   bool OpenResource(const char* file, int* fd);
 
  private:
-  scoped_ptr<IPC::ChannelProxy> channel_;
+  scoped_ptr<IPC::SyncChannel> channel_;
   scoped_refptr<IPC::SyncMessageFilter> filter_;
 
   base::Lock open_resource_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(ManifestService);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_NACL_IRT_MANIFEST_SERVICE_H_