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

content/browser/vibration/vibration_message_filter.cc

Index: content/browser/vibration/vibration_message_filter.cc
===================================================================
--- content/browser/vibration/vibration_message_filter.cc	(revision 271040)
+++ content/browser/vibration/vibration_message_filter.cc	(working copy)
@@ -29,16 +29,13 @@
 }
 
 bool VibrationMessageFilter::OnMessageReceived(
-    const IPC::Message& message,
-    bool* message_was_ok) {
+    const IPC::Message& message) {
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(VibrationMessageFilter,
-                           message,
-                           *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(VibrationMessageFilter, message)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Vibrate, OnVibrate)
     IPC_MESSAGE_HANDLER(ViewHostMsg_CancelVibration, OnCancelVibration)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
   return handled;
 }