Remove duration from media::Clock.

media/base/clock.h

 // 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.
 
 #ifndef MEDIA_BASE_CLOCK_H_
 #define MEDIA_BASE_CLOCK_H_
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "media/base/media_export.h"
@@ skipping 36 matching lines @@
   // constant until Play() is called.
   base::TimeDelta Pause();
 
   // Sets a new playback rate.  The rate at which the media time will increase
   // will now change.
   void SetPlaybackRate(float playback_rate);
 
   // Forcefully sets the media time to |current_time|. The second parameter is
   // the |max_time| that the clock should progress after a call to Play(). This
   // value is often the time of the end of the last frame buffered and decoded.
-  //
-  // These values are clamped to the duration of the video, which is initially
-  // set to 0 (before SetDuration() is called).
   void SetTime(base::TimeDelta current_time, base::TimeDelta max_time);
 
   // Sets the |max_time| to be returned by a call to Elapsed().
   void SetMaxTime(base::TimeDelta max_time);
 
-  // Returns the current elapsed media time. Returns 0 if SetDuration() has
-  // never been called.
+  // Returns the current elapsed media time.
   base::TimeDelta Elapsed();
 
-  // Sets the duration of the video. Clock expects the duration will be set
-  // exactly once.
-  void SetDuration(base::TimeDelta duration);
-
-  // Returns the duration of the clock, or 0 if not set.
-  base::TimeDelta Duration() const;
-
  private:
   // Updates the reference points based on the current calculated time.
   void UpdateReferencePoints();
 
   // Updates the reference points based on the given |current_time|.
   void UpdateReferencePoints(base::TimeDelta current_time);
 
   // Returns the time elapsed based on the current reference points, ignoring
   // the |max_time_| cap.
   base::TimeDelta EstimatedElapsedTime();
@@ skipping 20 matching lines @@
   // Current accumulated amount of media time.  The remaining portion must be
   // calculated by comparing the system time to the reference time.
   base::TimeDelta media_time_;
 
   // Current playback rate.
   float playback_rate_;
 
   // The maximum time that can be returned by calls to Elapsed().
   base::TimeDelta max_time_;
 
-  // Duration of the media.
-  base::TimeDelta duration_;
-
   DISALLOW_COPY_AND_ASSIGN(Clock);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_CLOCK_H_