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

content/browser/browser_child_process_host_impl.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 "content/browser/browser_child_process_host_impl.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 243 matching lines @@
   delegate_->OnChannelConnected(peer_pid);
 }
 
 void BrowserChildProcessHostImpl::OnChannelError() {
   delegate_->OnChannelError();
 }
 
 void BrowserChildProcessHostImpl::OnBadMessageReceived(
     const IPC::Message& message) {
   HistogramBadMessageTerminated(data_.process_type);
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableKillAfterBadIPC)) {
+    return;
+  }
   base::KillProcess(GetHandle(), RESULT_CODE_KILLED_BAD_MESSAGE, false);
 }
 
 bool BrowserChildProcessHostImpl::CanShutdown() {
   return delegate_->CanShutdown();
 }
 
 void BrowserChildProcessHostImpl::OnChildDisconnected() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (child_process_.get() || data_.handle) {
@@ skipping 85 matching lines @@
 
 void BrowserChildProcessHostImpl::OnProcessExitedEarly(
     base::WaitableEvent* event) {
   DeleteProcessWaitableEvent(event);
   OnChildDisconnected();
 }
 
 #endif
 
 }  // namespace content