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

content/browser/renderer_host/media/media_stream_track_metrics_host.cc

 // Copyright 2014 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/renderer_host/media/media_stream_track_metrics_host.h"
 
 #include "base/metrics/histogram.h"
 #include "content/common/media/media_stream_track_metrics_host_messages.h"
 
 // We use a histogram with a maximum bucket of 16 hours to infinity
@@ skipping 16 matching lines @@
   for (TrackMap::iterator it = tracks_.begin();
        it != tracks_.end();
        ++it) {
     TrackInfo& info = it->second;
     ReportDuration(info);
   }
   tracks_.clear();
 }
 
 bool MediaStreamTrackMetricsHost::OnMessageReceived(
-    const IPC::Message& message,
-    bool* message_was_ok) {
+    const IPC::Message& message) {
   bool handled = true;
 
-  IPC_BEGIN_MESSAGE_MAP_EX(MediaStreamTrackMetricsHost,
-                           message,
-                           *message_was_ok)
+  IPC_BEGIN_MESSAGE_MAP(MediaStreamTrackMetricsHost, message)
     IPC_MESSAGE_HANDLER(MediaStreamTrackMetricsHost_AddTrack, OnAddTrack)
     IPC_MESSAGE_HANDLER(MediaStreamTrackMetricsHost_RemoveTrack, OnRemoveTrack)
     IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP_EX()
+  IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
 void MediaStreamTrackMetricsHost::OnAddTrack(uint64 id,
                                              bool is_audio,
                                              bool is_remote) {
   DCHECK(tracks_.find(id) == tracks_.end());
   TrackInfo info = {is_audio, is_remote, base::TimeTicks::Now()};
   tracks_[id] = info;
@@ skipping 22 matching lines @@
       DVLOG(3) << "WebRTC.SentAudioTrackDuration: " << duration.InSeconds();
       UMA_HISTOGRAM_TIMES_16H("WebRTC.SentAudioTrackDuration", duration);
     } else {
       DVLOG(3) << "WebRTC.SentVideoTrackDuration: " << duration.InSeconds();
       UMA_HISTOGRAM_TIMES_16H("WebRTC.SentVideoTrackDuration", duration);
     }
   }
 }
 
 }  // namespace content