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

chrome/browser/speech/tts_message_filter.cc

Index: chrome/browser/speech/tts_message_filter.cc
===================================================================
--- chrome/browser/speech/tts_message_filter.cc	(revision 271040)
+++ chrome/browser/speech/tts_message_filter.cc	(working copy)
@@ -35,10 +35,9 @@
   }
 }
 
-bool TtsMessageFilter::OnMessageReceived(const IPC::Message& message,
-                                         bool* message_was_ok) {
+bool TtsMessageFilter::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(TtsMessageFilter, message, *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(TtsMessageFilter, message)
     IPC_MESSAGE_HANDLER(TtsHostMsg_InitializeVoiceList, OnInitializeVoiceList)
     IPC_MESSAGE_HANDLER(TtsHostMsg_Speak, OnSpeak)
     IPC_MESSAGE_HANDLER(TtsHostMsg_Pause, OnPause)