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

chrome/browser/printing/printing_message_filter.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 25 matching lines @@
 // This class filters out incoming printing related IPC messages for the
 // renderer process on the IPC thread.
 class PrintingMessageFilter : public content::BrowserMessageFilter {
  public:
   PrintingMessageFilter(int render_process_id, Profile* profile);
 
   // content::BrowserMessageFilter methods.
   virtual void OverrideThreadForMessage(
       const IPC::Message& message,
       content::BrowserThread::ID* thread) OVERRIDE;
-  virtual bool OnMessageReceived(const IPC::Message& message,
-                                 bool* message_was_ok) OVERRIDE;
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   virtual ~PrintingMessageFilter();
 
 #if defined(OS_WIN)
   // Used to pass resulting EMF from renderer to browser in printing.
   void OnDuplicateSection(base::SharedMemoryHandle renderer_handle,
                           base::SharedMemoryHandle* browser_handle);
 #endif
 
@@ skipping 76 matching lines @@
   ProfileIOData* profile_io_data_;
 
   const int render_process_id_;
 
   scoped_refptr<printing::PrintQueriesQueue> queue_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintingMessageFilter);
 };
 
 #endif  // CHROME_BROWSER_PRINTING_PRINTING_MESSAGE_FILTER_H_