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

content/browser/renderer_host/media/midi_host.cc

 // Copyright (c) 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.
 
 #include "content/browser/renderer_host/media/midi_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/process/process.h"
@@ skipping 49 matching lines @@
 MidiHost::~MidiHost() {
   if (midi_manager_)
     midi_manager_->EndSession(this);
 }
 
 void MidiHost::OnDestruct() const {
   BrowserThread::DeleteOnIOThread::Destruct(this);
 }
 
 // IPC Messages handler
-bool MidiHost::OnMessageReceived(const IPC::Message& message,
-                                 bool* message_was_ok) {
+bool MidiHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(MidiHost, message, *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(MidiHost, message)
     IPC_MESSAGE_HANDLER(MidiHostMsg_StartSession, OnStartSession)
     IPC_MESSAGE_HANDLER(MidiHostMsg_SendData, OnSendData)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
 void MidiHost::OnStartSession(int client_id) {
   if (midi_manager_)
     midi_manager_->StartSession(this, client_id);
 }
 
 void MidiHost::OnSendData(uint32 port,
@@ skipping 129 matching lines @@
     }
     waiting_data_length = media::GetMidiMessageLength(current);
     if (waiting_data_length == 0)
       return false;  // Error: |current| should have been a valid status byte.
     --waiting_data_length;  // Found status byte
   }
   return waiting_data_length == 0 && !in_sysex;
 }
 
 }  // namespace content