Cast: Deduplicate event types in cast library.

media/cast/audio_receiver/audio_receiver.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 MEDIA_CAST_AUDIO_RECEIVER_AUDIO_RECEIVER_H_
 #define MEDIA_CAST_AUDIO_RECEIVER_AUDIO_RECEIVER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/macros.h"
@@ skipping 150 matching lines @@
   uint32 first_incoming_rtp_timestamp_;
   transport::TransportEncryptionHandler decryptor_;
 
   // Outstanding callbacks to run to deliver on client requests for frames.
   std::list<AudioFrameEncodedCallback> frame_request_queue_;
 
   // True while there's an outstanding task to re-invoke
   // EmitAvailableEncodedFrames().
   bool is_waiting_for_consecutive_frame_;
 
-  // This mapping allows us to log kAudioAckSent as a frame event. In addition
+  // This mapping allows us to log AUDIO_ACK_SENT as a frame event. In addition
   // it allows the event to be transmitted via RTCP.
   RtpTimestamp frame_id_to_rtp_timestamp_[256];
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<AudioReceiver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioReceiver);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_AUDIO_RECEIVER_AUDIO_RECEIVER_H_