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

content/browser/histogram_message_filter.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/histogram_message_filter.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "content/browser/histogram_controller.h"
 #include "content/browser/tcmalloc_internals_request_job.h"
 #include "content/common/child_process_messages.h"
 #include "content/public/common/content_switches.h"
 
 namespace content {
 
 HistogramMessageFilter::HistogramMessageFilter()
     : BrowserMessageFilter(ChildProcessMsgStart) {}
 
-bool HistogramMessageFilter::OnMessageReceived(const IPC::Message& message,
-                                              bool* message_was_ok) {
+bool HistogramMessageFilter::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP_EX(HistogramMessageFilter, message, *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(HistogramMessageFilter, message)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_ChildHistogramData,
                         OnChildHistogramData)
     IPC_MESSAGE_HANDLER(ChildProcessHostMsg_GetBrowserHistogram,
                         OnGetBrowserHistogram)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 HistogramMessageFilter::~HistogramMessageFilter() {}
 
 void HistogramMessageFilter::OnChildHistogramData(
     int sequence_number,
     const std::vector<std::string>& pickled_histograms) {
   HistogramController::GetInstance()->OnHistogramDataCollected(
       sequence_number, pickled_histograms);
@@ skipping 16 matching lines @@
   base::HistogramBase* histogram =
       base::StatisticsRecorder::FindHistogram(name);
   if (!histogram) {
     *histogram_json = "{}";
   } else {
     histogram->WriteJSON(histogram_json);
   }
 }
 
 }  // namespace content