Remove VideoFrameScheduler and dependents.

media/filters/video_frame_scheduler.h

-// Copyright 2014 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 MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_H_
-#define MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_H_
-
-#include "base/callback.h"
-#include "base/memory/ref_counted.h"
-#include "base/time/time.h"
-#include "media/base/media_export.h"
-
-namespace media {
-
-class VideoFrame;
-
-// Defines an abstract video frame scheduler that is capable of managing the
-// display of video frames at explicit times.
-class MEDIA_EXPORT VideoFrameScheduler {
- public:
-  VideoFrameScheduler() {}
-  virtual ~VideoFrameScheduler() {}
-
-  enum Reason {
-    DISPLAYED,  // Frame was displayed.
-    DROPPED,    // Frame was dropped.
-  };
-  typedef base::Callback<void(const scoped_refptr<VideoFrame>&, Reason)> DoneCB;
-
-  // Schedule |frame| to be displayed at |wall_ticks|, firing |done_cb| when
-  // the scheduler has finished with the frame.
-  //
-  // To avoid reentrancy issues, |done_cb| is run on a separate calling stack.
-  virtual void ScheduleVideoFrame(const scoped_refptr<VideoFrame>& frame,
-                                  base::TimeTicks wall_ticks,
-                                  const DoneCB& done_cb) = 0;
-
-  // Causes the scheduler to cancel any previously scheduled frames.
-  //
-  // There is no guarantee that |done_cb|'s for previously scheduled frames
-  // will not be run. Clients should implement callback tracking/cancellation
-  // if they are sensitive to old callbacks being run.
-  virtual void Reset() = 0;
-};
-
-}  // namespace media
-
-#endif  // MEDIA_FILTERS_VIDEO_FRAME_SCHEDULER_H_