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

chrome/browser/prerender/prerender_browsertest.cc

 // 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.
 
 #include <deque>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 204 matching lines @@
     }
 
    private:
     virtual ~DestructionMessageFilter() {
       content::BrowserThread::PostTask(
           content::BrowserThread::UI, FROM_HERE,
           base::Bind(&ChannelDestructionWatcher::OnChannelDestroyed,
                      base::Unretained(watcher_)));
     }
 
-    virtual bool OnMessageReceived(const IPC::Message& message,
-                                   bool* message_was_ok) OVERRIDE {
+    virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
       return false;
     }
 
     ChannelDestructionWatcher* watcher_;
 
     DISALLOW_COPY_AND_ASSIGN(DestructionMessageFilter);
   };
 
   void OnChannelDestroyed() {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
@@ skipping 4175 matching lines @@
 
   // Navigate to the URL entered.
   omnibox_view->model()->AcceptInput(CURRENT_TAB, false);
 
   // Prerender should be running, but abandoned.
   EXPECT_TRUE(
       GetAutocompleteActionPredictor()->IsPrerenderAbandonedForTesting());
 }
 
 }  // namespace prerender