Migrate content/ files to histogram_macros.h includes.

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 "base/metrics/histogram_macros.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
 // for track durations.
 #define UMA_HISTOGRAM_TIMES_16H(name, sample)                        \
   UMA_HISTOGRAM_CUSTOM_TIMES(name, sample,                           \
                              base::TimeDelta::FromMilliseconds(100), \
                              base::TimeDelta::FromHours(16),         \
                              50);
 
@@ skipping 62 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