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

chrome/browser/chrome_net_benchmarking_message_filter.h

Index: chrome/browser/chrome_net_benchmarking_message_filter.h
===================================================================
--- chrome/browser/chrome_net_benchmarking_message_filter.h	(revision 271040)
+++ chrome/browser/chrome_net_benchmarking_message_filter.h	(working copy)
@@ -23,8 +23,7 @@
       net::URLRequestContextGetter* request_context);
 
   // content::BrowserMessageFilter methods:
-  virtual bool OnMessageReceived(const IPC::Message& message,
-                                 bool* message_was_ok) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   virtual ~ChromeNetBenchmarkingMessageFilter();