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

content/browser/frame_host/render_frame_message_filter.cc

Index: content/browser/frame_host/render_frame_message_filter.cc
===================================================================
--- content/browser/frame_host/render_frame_message_filter.cc	(revision 271040)
+++ content/browser/frame_host/render_frame_message_filter.cc	(working copy)
@@ -39,13 +39,12 @@
 RenderFrameMessageFilter::~RenderFrameMessageFilter() {
 }
 
-bool RenderFrameMessageFilter::OnMessageReceived(const IPC::Message& message,
-                                                 bool* message_was_ok) {
+bool RenderFrameMessageFilter::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(RenderFrameMessageFilter, message, *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(RenderFrameMessageFilter, message)
     IPC_MESSAGE_HANDLER(FrameHostMsg_CreateChildFrame, OnCreateChildFrame)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
 
   return handled;
 }