Move classses VideoCaptureDeviceClient and VideoCaptureBufferPool to media/capture/video

content/browser/renderer_host/media/video_capture_buffer_tracker_factory.cc

-// Copyright 2016 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_buffer_tracker_factory.h"
-
-#include "base/memory/ptr_util.h"
-
-#include "content/browser/renderer_host/media/gpu_memory_buffer_tracker.h"
-#include "content/browser/renderer_host/media/shared_memory_buffer_tracker.h"
-
-namespace content {
-
-// static
-std::unique_ptr<VideoCaptureBufferTracker>
-VideoCaptureBufferTrackerFactory::CreateTracker(
-    media::VideoPixelStorage storage) {
-  switch (storage) {
-    case media::PIXEL_STORAGE_GPUMEMORYBUFFER:
-      return base::MakeUnique<GpuMemoryBufferTracker>();
-    case media::PIXEL_STORAGE_CPU:
-      return base::MakeUnique<SharedMemoryBufferTracker>();
-  }
-  NOTREACHED();
-  return std::unique_ptr<VideoCaptureBufferTracker>();
-}
-
-}  // namespace content