Remove the checksum/HMAC code from the decryptor.

media/webm/webm_constants.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_WEBM_WEBM_CONSTANTS_H_
 #define MEDIA_WEBM_WEBM_CONSTANTS_H_
 
 #include "base/basictypes.h"
 
 namespace media {
@@ skipping 181 matching lines @@
 const int kWebMIdTrackUID = 0x73C5;
 const int kWebMIdVideo = 0xE0;
 const int kWebMIdVoid = 0xEC;
 const int kWebMIdWritingApp = 0x5741;
 
 const int64 kWebMReservedId = 0x1FFFFFFF;
 const int64 kWebMUnknownSize = GG_LONGLONG(0x00FFFFFFFFFFFFFF);
 
 const uint8 kWebMFlagKeyframe = 0x80;
 
-// The size is from the WebM encrypted specification. Current encrypted WebM
-// request for comments specification is here
+// Current encrypted WebM request for comments specification is here
 // http://wiki.webmproject.org/encryption/webm-encryption-rfc
 const uint8 kWebMFlagEncryptedFrame = 0x1;
-const int kWebMHmacSize = 12;
 
 }  // namespace media
 
 #endif  // MEDIA_WEBM_WEBM_CONSTANTS_H_