Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/base/media_log.cc

 // 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.
 
 #include "media/base/media_log.h"
 
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/json/json_writer.h"
@@ skipping 360 matching lines @@
 }
 
 void MediaLog::SetBooleanProperty(
     const std::string& key, bool value) {
   std::unique_ptr<MediaLogEvent> event(
       CreateEvent(MediaLogEvent::PROPERTY_CHANGE));
   event->params.SetBoolean(key, value);
   AddEvent(std::move(event));
 }
 
-LogHelper::LogHelper(MediaLog::MediaLogLevel level,
-                     const scoped_refptr<MediaLog>& media_log)
+LogHelper::LogHelper(MediaLog::MediaLogLevel level, MediaLog* media_log)
     : level_(level), media_log_(media_log) {
-  DCHECK(media_log_.get());
+  DCHECK(media_log_);
 }
 
 LogHelper::~LogHelper() {
   media_log_->AddLogEvent(level_, stream_.str());
 }
 
 }  //namespace media