Revert 149449 - Add support for v0.3 of the encrypted WebM specification.

media/base/decrypt_config.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_BASE_DECRYPT_CONFIG_H_
 #define MEDIA_BASE_DECRYPT_CONFIG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 18 matching lines @@
 };
 
 // Contains all information that a decryptor needs to decrypt a media sample.
 class MEDIA_EXPORT DecryptConfig {
  public:
   // Keys are always 128 bits.
   static const int kDecryptionKeySize = 16;
 
   // |key_id| is the ID that references the decryption key for this sample.
   // |iv| is the initialization vector defined by the encrypted format.
-  //   Currently |iv| must be 16 bytes as defined by WebM and ISO. Or must be
-  //   empty which signals to perform the integrity check on an unencrypted
-  //   frame as defined WebM.
+  //   Currently |iv_size| must be 16 bytes as defined by WebM and ISO.
   // |checksum| is the hash value of the encrypted buffer. |checksum| is
   //   defined by the encrypted format and may be NULL.
   // |data_offset| is the amount of data that should be discarded from the
   //   head of the sample buffer before applying subsample information. A
   //   decrypted buffer will be shorter than an encrypted buffer by this amount.
   // |subsamples| defines the clear and encrypted portions of the sample as
   //   described above. A decrypted buffer will be equal in size to the sum
   //   of the subsample sizes.
   //
   // |data_offset| is applied after |checksum|, but before |subsamples|.
@@ skipping 26 matching lines @@
   // Subsample information. May be empty for some formats, meaning entire frame
   // (less data ignored by data_offset_) is encrypted.
   const std::vector<SubsampleEntry> subsamples_;
 
   DISALLOW_COPY_AND_ASSIGN(DecryptConfig);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DECRYPT_CONFIG_H_