Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/mojo/services/test_mojo_media_client.cc

Index: media/mojo/services/test_mojo_media_client.cc
diff --git a/media/mojo/services/test_mojo_media_client.cc b/media/mojo/services/test_mojo_media_client.cc
index fee57e4ee30cbb2578ba9dd1792cac0074d97322..f47188b94676114f17a348351d3c1fa6f22e31a5 100644
--- a/media/mojo/services/test_mojo_media_client.cc
+++ b/media/mojo/services/test_mojo_media_client.cc
@@ -62,10 +62,9 @@ std::unique_ptr<VideoRendererSink> TestMojoMediaClient::CreateVideoRendererSink(
 }
 
 std::unique_ptr<RendererFactory> TestMojoMediaClient::CreateRendererFactory(
-    const scoped_refptr<MediaLog>& media_log) {
+    MediaLog* media_log) {
   return base::MakeUnique<DefaultRendererFactory>(
-      std::move(media_log), nullptr,
-      DefaultRendererFactory::GetGpuFactoriesCB());
+      media_log, nullptr, DefaultRendererFactory::GetGpuFactoriesCB());
 }
 
 std::unique_ptr<CdmFactory> TestMojoMediaClient::CreateCdmFactory(