Cast: Clarify the unit of bitrate

chrome/renderer/media/cast_rtp_stream.h

 // Copyright 2013 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 CHROME_RENDERER_MEDIA_CAST_RTP_STREAM_H_
 #define CHROME_RENDERER_MEDIA_CAST_RTP_STREAM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 29 matching lines @@
 
   // RTP specific field to identify a stream.
   int ssrc;
 
   // RTP specific field to idenfity the feedback stream.
   int feedback_ssrc;
 
   // Update frequency of payload sample.
   int clock_rate;
 
-  // Maximum bitrate.
+  // Maximum bitrate in kilobits per second.
   int max_bitrate;
 
-  // Minimum bitrate.
+  // Minimum bitrate in kilobits per second.
   int min_bitrate;
 
   // Number of audio channels.
   int channels;
 
   // Width and height of the video content.
   int width;
   int height;
 
   // Name of the codec used.
@@ skipping 84 matching lines @@
   scoped_ptr<CastVideoSink> video_sink_;
   CastRtpParams params_;
   base::WeakPtrFactory<CastRtpStream> weak_factory_;
   base::Closure stop_callback_;
   ErrorCallback error_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(CastRtpStream);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CAST_RTP_STREAM_H_