Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/renderers/default_renderer_factory.h

Index: media/renderers/default_renderer_factory.h
diff --git a/media/renderers/default_renderer_factory.h b/media/renderers/default_renderer_factory.h
index 3cef53ae914f63fcb8e193bd677033fe13d0dd03..ba6a9365af99a6bec57780229c03c6f4181ddb76 100644
--- a/media/renderers/default_renderer_factory.h
+++ b/media/renderers/default_renderer_factory.h
@@ -33,7 +33,7 @@ class MEDIA_EXPORT DefaultRendererFactory : public RendererFactory {
  public:
   using GetGpuFactoriesCB = base::Callback<GpuVideoAcceleratorFactories*()>;
 
-  DefaultRendererFactory(const scoped_refptr<MediaLog>& media_log,
+  DefaultRendererFactory(MediaLog* media_log,
                          DecoderFactory* decoder_factory,
                          const GetGpuFactoriesCB& get_gpu_factories_cb);
   ~DefaultRendererFactory() final;
@@ -53,7 +53,7 @@ class MEDIA_EXPORT DefaultRendererFactory : public RendererFactory {
       const RequestSurfaceCB& request_surface_cb,
       GpuVideoAcceleratorFactories* gpu_factories);
 
-  scoped_refptr<MediaLog> media_log_;
+  MediaLog* media_log_;
 
   // Factory to create extra audio and video decoders.
   // Could be nullptr if not extra decoders are available.