Use std::string for decryption key ID in webm parser.

media/webm/webm_content_encodings.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_CONTENT_ENCODINGS_H_
 #define MEDIA_WEBM_WEBM_CONTENT_ENCODINGS_H_
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class MEDIA_EXPORT ContentEncoding {
  public:
   // The following enum definitions are based on the ContentEncoding element
   // specified in the Matroska spec.
@@ skipping 39 matching lines @@
   void set_scope(Scope scope) { scope_ = scope; }
 
   Type type() const { return type_; }
   void set_type(Type type) { type_ = type; }
 
   EncryptionAlgo encryption_algo() const { return encryption_algo_; }
   void set_encryption_algo(EncryptionAlgo encryption_algo) {
     encryption_algo_ = encryption_algo;
   }
 
-  const uint8* encryption_key_id() const { return encryption_key_id_.get(); }
-  int encryption_key_id_size() const { return encryption_key_id_size_; }
-
+  const std::string& encryption_key_id() const { return encryption_key_id_; }
   void SetEncryptionKeyId(const uint8* encryption_key_id, int size);
 
   CipherMode cipher_mode() const { return cipher_mode_; }
   void set_cipher_mode(CipherMode mode) { cipher_mode_ = mode; }
 
  private:
   int64 order_;
   Scope scope_;
   Type type_;
   EncryptionAlgo encryption_algo_;
-  scoped_array<uint8> encryption_key_id_;
-  int encryption_key_id_size_;
+  std::string encryption_key_id_;
   CipherMode cipher_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentEncoding);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_WEBM_WEBM_CONTENT_ENCODINGS_H_