Add struct traits for base::Value.

content/browser/renderer_host/media/video_capture_controller.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/renderer_host/media/video_capture_controller.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 418 matching lines @@
                                      buffer_pool_, frame)))
           .first;
   BufferState& buffer_state = it->second;
   DCHECK(buffer_state.HasZeroConsumerHoldCount());
 
   if (state_ == VIDEO_CAPTURE_STATE_STARTED) {
     if (!frame->metadata()->HasKey(VideoFrameMetadata::FRAME_RATE)) {
       frame->metadata()->SetDouble(VideoFrameMetadata::FRAME_RATE,
                                    video_capture_format_.frame_rate);
     }
-    std::unique_ptr<base::DictionaryValue> metadata(
-        new base::DictionaryValue());
-    frame->metadata()->MergeInternalValuesInto(metadata.get());
+    std::unique_ptr<base::DictionaryValue> metadata =
+        frame->metadata()->CopyInternalValues();
 
     // Only I420 and Y16 pixel formats are currently supported.
     DCHECK(frame->format() == media::PIXEL_FORMAT_I420 ||
            frame->format() == media::PIXEL_FORMAT_Y16)
         << "Unsupported pixel format: "
         << media::VideoPixelFormatToString(frame->format());
 
     // Sanity-checks to confirm |frame| is actually being backed by |buffer|.
     DCHECK(frame->storage_type() == media::VideoFrame::STORAGE_SHMEM);
     DCHECK(frame->data(media::VideoFrame::kYPlane) >= buffer->data(0) &&
@@ skipping 116 matching lines @@
     int session_id,
     const ControllerClients& clients) {
   for (const auto& client : clients) {
     if (client->session_id == session_id)
       return client.get();
   }
   return nullptr;
 }
 
 }  // namespace content