[Mojo Video Capture] Simplify API and some cleanups

services/video_capture/video_capture_device_proxy_impl.h

 // 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.
 
 #ifndef SERVICES_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_IMPL_H_
 #define SERVICES_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_IMPL_H_
 
 #include "media/capture/video/video_capture_device.h"
 #include "media/capture/video/video_capture_device_client.h"
 #include "media/capture/video_capture_types.h"
 #include "services/video_capture/public/interfaces/video_capture_device_proxy.mojom.h"
 
 namespace video_capture {
 
 // Implementation of mojom::VideoCaptureDeviceProxy backed by a given instance
 // of media::VideoCaptureDevice.
 class VideoCaptureDeviceProxyImpl : public mojom::VideoCaptureDeviceProxy {
  public:
   VideoCaptureDeviceProxyImpl(std::unique_ptr<media::VideoCaptureDevice> device,
                               const media::VideoCaptureJpegDecoderFactoryCB&
                                   jpeg_decoder_factory_callback);
   ~VideoCaptureDeviceProxyImpl() override;
 
   // mojom::VideoCaptureDeviceProxy:
-  void Start(const media::VideoCaptureFormat& requested_format,
-             media::ResolutionChangePolicy resolution_change_policy,
-             media::PowerLineFrequency power_line_frequency,
+  void Start(const VideoCaptureSettings& requested_settings,
              mojom::VideoFrameReceiverPtr receiver) override;
 
   void Stop();
 
   void OnClientConnectionErrorOrClose();
 
  private:
   const std::unique_ptr<media::VideoCaptureDevice> device_;
   media::VideoCaptureJpegDecoderFactoryCB jpeg_decoder_factory_callback_;
   bool device_running_;
 };
 
 }  // namespace video_capture
 
 #endif  // SERVICES_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_IMPL_H_