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

content/browser/renderer_host/gpu_message_filter.cc

Index: content/browser/renderer_host/gpu_message_filter.cc
===================================================================
--- content/browser/renderer_host/gpu_message_filter.cc	(revision 271040)
+++ content/browser/renderer_host/gpu_message_filter.cc	(working copy)
@@ -67,17 +67,15 @@
   EndAllFrameSubscriptions();
 }
 
-bool GpuMessageFilter::OnMessageReceived(
-    const IPC::Message& message,
-    bool* message_was_ok) {
+bool GpuMessageFilter::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(GpuMessageFilter, message, *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(GpuMessageFilter, message)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuHostMsg_EstablishGpuChannel,
                                     OnEstablishGpuChannel)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuHostMsg_CreateViewCommandBuffer,
                                     OnCreateViewCommandBuffer)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
   return handled;
 }