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

chrome/browser/signin/principals_message_filter.h

 // Copyright 2013 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_SIGNIN_PRINCIPALS_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_SIGNIN_PRINCIPALS_MESSAGE_FILTER_H_
 
 #include "content/public/browser/browser_message_filter.h"
 
 class GURL;
 class Profile;
 
 // A message filter implementation that receives messages for browser account
 // management from the renderer.
 class PrincipalsMessageFilter : public content::BrowserMessageFilter {
  public:
   explicit PrincipalsMessageFilter(int render_process_id);
 
   // content::BrowserMessageFilter implementation.
   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 ~PrincipalsMessageFilter();
 
   void OnMsgShowBrowserAccountManagementUI();
   void OnMsgGetManagedAccounts(const GURL& url,
                                std::vector<std::string>* managed_accounts);
 
   int render_process_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PrincipalsMessageFilter);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_PRINCIPALS_MESSAGE_FILTER_H_