Migrate content/ files to histogram_macros.h includes.

content/renderer/media/gpu/rtc_video_decoder.cc

 // Copyright 2013 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/renderer/media/gpu/rtc_video_decoder.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/task_runner_util.h"
 #include "content/renderer/media/webrtc/webrtc_video_frame_adapter.h"
 #include "gpu/command_buffer/common/mailbox_holder.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/renderers/gpu_video_accelerator_factories.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/webrtc/base/bind.h"
 #include "third_party/webrtc/base/refcount.h"
@@ skipping 863 matching lines @@
 }
 
 void RTCVideoDecoder::ClearPendingBuffers() {
   // Delete WebRTC input buffers.
   for (const auto& pending_buffer : pending_buffers_)
     delete[] pending_buffer.first._buffer;
   pending_buffers_.clear();
 }
 
 }  // namespace content