Convert media constants to constexpr.

media/base/demuxer.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_DEMUXER_H_
 #define MEDIA_BASE_DEMUXER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 19 matching lines @@
  public:
   // Notify the host that buffered time ranges have changed. Note that buffered
   // time ranges can grow (when new media data is appended), but they can also
   // shrink (when buffering reaches limit capacity and some buffered data
   // becomes evicted, e.g. due to MSE GC algorithm, or by explicit removal of
   // ranges directed by MSE web app).
   virtual void OnBufferedTimeRangesChanged(
       const Ranges<base::TimeDelta>& ranges) = 0;
 
   // Sets the duration of the media in microseconds.
-  // Duration may be kInfiniteDuration() if the duration is not known.
+  // Duration may be kInfiniteDuration if the duration is not known.
   virtual void SetDuration(base::TimeDelta duration) = 0;
 
   // Stops execution of the pipeline due to a fatal error. Do not call this
   // method with PIPELINE_OK. Stopping is not immediate so demuxers must be
   // prepared to soft fail on subsequent calls. E.g., if Demuxer::Seek() is
   // called after an unrecoverable error the provided PipelineStatusCB must be
   // called with an error.
   virtual void OnDemuxerError(PipelineStatus error) = 0;
 
   // Add |text_stream| to the collection managed by the text renderer.
@@ skipping 94 matching lines @@
       const std::vector<MediaTrack::Id>& track_ids,
       base::TimeDelta currTime) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Demuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_H_