Remove IPC_BEGIN_MESSAGE_MAP_EX macro since r270839 made all bad IPCs kill their child processes.

content/browser/renderer_host/media/midi_dispatcher_host.h

 // Copyright 2013 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_MEDIA_MIDI_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_DISPATCHER_HOST_H_
 
 #include "content/public/browser/browser_message_filter.h"
 
 class GURL;
 
 namespace content {
 
 class BrowserContext;
 
 // MidiDispatcherHost handles permissions for using system exclusive messages.
 // It works as BrowserMessageFilter to handle IPC messages between
 // MidiDispatcher running as a RenderViewObserver.
 class MidiDispatcherHost : public BrowserMessageFilter {
  public:
   MidiDispatcherHost(int render_process_id, BrowserContext* browser_context);
 
   // BrowserMessageFilter implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message,
-                                 bool* message_was_ok) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OverrideThreadForMessage(
       const IPC::Message& message, BrowserThread::ID* thread) OVERRIDE;
 
  protected:
   virtual ~MidiDispatcherHost();
 
  private:
   void OnRequestSysExPermission(int render_view_id,
                                 int bridge_id,
                                 const GURL& origin,
                                 bool user_gesture);
   void OnCancelSysExPermissionRequest(int render_view_id,
                                       int bridge_id,
                                       const GURL& requesting_frame);
   void WasSysExPermissionGranted(int render_view_id,
                                  int bridge_id,
                                  bool success);
 
   int render_process_id_;
   BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MIDI_DISPATCHER_HOST_H_