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

chrome/browser/spellchecker/spellcheck_message_filter_mac_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 "base/command_line.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/spellchecker/spellcheck_message_filter_mac.h"
@@ skipping 27 matching lines @@
 typedef InProcessBrowserTest SpellCheckMessageFilterMacBrowserTest;
 
 // Uses browsertest to setup chrome threads.
 IN_PROC_BROWSER_TEST_F(SpellCheckMessageFilterMacBrowserTest,
                        SpellCheckReturnMessage) {
   scoped_refptr<TestingSpellCheckMessageFilter> target(
       new TestingSpellCheckMessageFilter(base::MessageLoopForUI::current()));
 
   SpellCheckHostMsg_RequestTextCheck to_be_received(
       123, 456, base::UTF8ToUTF16("zz."), std::vector<SpellCheckMarker>());
-  bool handled = false;
-  target->OnMessageReceived(to_be_received, &handled);
-  EXPECT_TRUE(handled);
+  target->OnMessageReceived(to_be_received);
 
   base::MessageLoopForUI::current()->Run();
   EXPECT_EQ(1U, target->sent_messages_.size());
 
   SpellCheckMsg_RespondTextCheck::Param params;
   bool ok = SpellCheckMsg_RespondTextCheck::Read(
       target->sent_messages_[0], &params);
   std::vector<SpellCheckResult> sent_results = params.b;
  
   EXPECT_TRUE(ok);
   EXPECT_EQ(1U, sent_results.size());
   EXPECT_EQ(sent_results[0].location, 0);
   EXPECT_EQ(sent_results[0].length, 2);
   EXPECT_EQ(sent_results[0].decoration,
             SpellCheckResult::SPELLING);
 }