Make IPC::Channel::Listener:OnMessageReceived have a return value indicating ...

chrome/nacl/nacl_thread.h

 // Copyright (c) 2010 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 CHROME_NACL_NACL_THREAD_H_
 #define CHROME_NACL_NACL_THREAD_H_
 #pragma once
 
 #include "base/native_library.h"
 #include "chrome/common/child_thread.h"
 #include "chrome/common/nacl_types.h"
 
 // The NaClThread class represents a background thread where NaCl app gets
 // started.
 class NaClThread : public ChildThread {
  public:
   explicit NaClThread(bool debug);
   ~NaClThread();
   // Returns the one NaCl thread.
   static NaClThread* current();
 
  private:
-  virtual void OnControlMessageReceived(const IPC::Message& msg);
+  virtual bool OnControlMessageReceived(const IPC::Message& msg);
   void OnStartSelLdr(std::vector<nacl::FileDescriptor> handles);
 
   int debug_enabled_;
 
   // TODO(gregoryd): do we need to override Cleanup as in PluginThread?
   DISALLOW_COPY_AND_ASSIGN(NaClThread);
 };
 
 #endif  // CHROME_NACL_NACL_THREAD_H_