Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/mojo/services/mojo_media_client.cc

 // 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.
 
 #include "media/mojo/services/mojo_media_client.h"
 
 #include "base/single_thread_task_runner.h"
 #include "media/base/audio_decoder.h"
 #include "media/base/audio_renderer_sink.h"
 #include "media/base/cdm_factory.h"
@@ skipping 25 matching lines @@
     const std::string& audio_device_id) {
   return nullptr;
 }
 
 std::unique_ptr<VideoRendererSink> MojoMediaClient::CreateVideoRendererSink(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
   return nullptr;
 }
 
 std::unique_ptr<RendererFactory> MojoMediaClient::CreateRendererFactory(
-    const scoped_refptr<MediaLog>& media_log) {
+    MediaLog* media_log) {
   return nullptr;
 }
 
 std::unique_ptr<CdmFactory> MojoMediaClient::CreateCdmFactory(
     service_manager::mojom::InterfaceProvider* host_interfaces) {
   return nullptr;
 }
 
 }  // namespace media