[Chromecast] Upgrade to new CMA backend API

chromecast/media/cma/backend/media_clock_device_default.h

-// Copyright 2015 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 CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_DEFAULT_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_DEFAULT_H_
-
-#include "base/macros.h"
-#include "base/threading/thread_checker.h"
-#include "base/time/time.h"
-#include "chromecast/public/media/media_clock_device.h"
-
-namespace chromecast {
-namespace media {
-
-class MediaClockDeviceDefault : public MediaClockDevice {
- public:
-  MediaClockDeviceDefault();
-  ~MediaClockDeviceDefault() override;
-
-  // MediaClockDevice implementation.
-  State GetState() const override;
-  bool SetState(State new_state) override;
-  bool ResetTimeline(int64_t time_microseconds) override;
-  bool SetRate(float rate) override;
-  int64_t GetTimeMicroseconds() override;
-
- private:
-  State state_;
-
-  // Media time sampled at STC time |stc_|.
-  base::TimeDelta media_time_;
-  base::TimeTicks stc_;
-
-  float rate_;
-
-  base::ThreadChecker thread_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaClockDeviceDefault);
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_DEFAULT_H_