Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/formats/webm/webm_content_encodings_client.h

 // Copyright 2014 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_FORMATS_WEBM_WEBM_CONTENT_ENCODINGS_CLIENT_H_
 #define MEDIA_FORMATS_WEBM_WEBM_CONTENT_ENCODINGS_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "media/base/media_export.h"
 #include "media/base/media_log.h"
 #include "media/formats/webm/webm_content_encodings.h"
 #include "media/formats/webm/webm_parser.h"
 
 namespace media {
 
 typedef std::vector<std::unique_ptr<ContentEncoding>> ContentEncodings;
 
 // Parser for WebM ContentEncodings element.
 class MEDIA_EXPORT WebMContentEncodingsClient : public WebMParserClient {
  public:
-  explicit WebMContentEncodingsClient(const scoped_refptr<MediaLog>& media_log);
+  explicit WebMContentEncodingsClient(MediaLog* media_log);
   ~WebMContentEncodingsClient() override;
 
   const ContentEncodings& content_encodings() const;
 
   // WebMParserClient methods
   WebMParserClient* OnListStart(int id) override;
   bool OnListEnd(int id) override;
   bool OnUInt(int id, int64_t val) override;
   bool OnBinary(int id, const uint8_t* data, int size) override;
 
  private:
-  scoped_refptr<MediaLog> media_log_;
+  MediaLog* media_log_;
   std::unique_ptr<ContentEncoding> cur_content_encoding_;
   bool content_encryption_encountered_;
   ContentEncodings content_encodings_;
 
   // |content_encodings_| is ready. For debugging purpose.
   bool content_encodings_ready_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMContentEncodingsClient);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_WEBM_WEBM_CONTENT_ENCODINGS_CLIENT_H_