Remove a bunch of dead fields found by Scythe.

media/webm/webm_stream_parser.cc

 // 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.
 
 #include "media/webm/webm_stream_parser.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 #include "media/filters/ffmpeg_glue.h"
@@ skipping 309 matching lines @@
   WebMInfoParser info_parser;
   result = info_parser.Parse(cur, cur_size);
 
   if (result <= 0)
     return result;
 
   cur += result;
   cur_size -= result;
   bytes_parsed += result;
 
-  WebMTracksParser tracks_parser(info_parser.timecode_scale());
+  WebMTracksParser tracks_parser;
   result = tracks_parser.Parse(cur, cur_size);
 
   if (result <= 0)
     return result;
 
   bytes_parsed += result;
 
   base::TimeDelta duration = kInfiniteDuration();
 
   if (info_parser.duration() > 0) {
@@ skipping 91 matching lines @@
   if (!video_buffers.empty() && !video_cb_.Run(video_buffers))
     return -1;
 
   if (cluster_ended)
     end_of_segment_cb_.Run();
 
   return bytes_parsed;
 }
 
 }  // namespace media