Convert media constants to constexpr.

media/formats/mp2t/es_adapter_video.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_FORMATS_MP2T_ES_ADAPTER_VIDEO_H_
 #define MEDIA_FORMATS_MP2T_ES_ADAPTER_VIDEO_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 44 matching lines @@
   bool OnNewBuffer(
       const scoped_refptr<StreamParserBuffer>& stream_parser_buffer);
 
  private:
   typedef std::deque<scoped_refptr<StreamParserBuffer> > BufferQueue;
   typedef std::pair<int64_t, VideoDecoderConfig> ConfigEntry;
 
   void ProcessPendingBuffers(bool flush);
 
   // Return the PTS of the frame that comes just after |current_pts| in
-  // presentation order. Return kNoTimestamp() if not found.
+  // presentation order. Return kNoTimestamp if not found.
   base::TimeDelta GetNextFramePts(base::TimeDelta current_pts);
 
   // Replace the leading non key frames by |stream_parser_buffer|
   // (this one must be a key frame).
   void ReplaceDiscardedFrames(
       const scoped_refptr<StreamParserBuffer>& stream_parser_buffer);
 
   NewVideoConfigCB new_video_config_cb_;
   EmitBufferCB emit_buffer_cb_;
 
@@ skipping 21 matching lines @@
   // Number of frames to replace with the first valid key frame.
   int discarded_frame_count_;
 
   DISALLOW_COPY_AND_ASSIGN(EsAdapterVideo);
 };
 
 }  // namespace mp2t
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_MP2T_ES_ADAPTER_VIDEO_H_