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

chrome/browser/media/webrtc_logging_handler_host.cc

Index: chrome/browser/media/webrtc_logging_handler_host.cc
===================================================================
--- chrome/browser/media/webrtc_logging_handler_host.cc	(revision 271040)
+++ chrome/browser/media/webrtc_logging_handler_host.cc	(working copy)
@@ -262,16 +262,15 @@
   BrowserThread::DeleteOnIOThread::Destruct(this);
 }
 
-bool WebRtcLoggingHandlerHost::OnMessageReceived(const IPC::Message& message,
-                                                 bool* message_was_ok) {
+bool WebRtcLoggingHandlerHost::OnMessageReceived(const IPC::Message& message) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(WebRtcLoggingHandlerHost, message, *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(WebRtcLoggingHandlerHost, message)
     IPC_MESSAGE_HANDLER(WebRtcLoggingMsg_AddLogMessages, OnAddLogMessages)
     IPC_MESSAGE_HANDLER(WebRtcLoggingMsg_LoggingStopped,
                         OnLoggingStoppedInRenderer)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
 
   return handled;
 }