Simplify/Cleanup MediaClient

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 28ab50bc7b2c70fa0448b6d76df26fb470e43bbb..5b7db01bb927e747dcd43ee1edfd70125fffa664 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -154,6 +154,7 @@ class RenderAccessibilityImpl;
 class RendererMediaPlayerManager;
 class RendererPpapiHost;
 class RenderFrameObserver;
+class RenderMediaLog;
 class RenderViewImpl;
 class RenderWidget;
 class RenderWidgetFullscreenPepper;
@@ -1122,6 +1123,9 @@ class CONTENT_EXPORT RenderFrameImpl
 
   void InitializeBlameContext(RenderFrameImpl* parent_frame);
 
+  // Lazy constructs a RenderMediaLog for use across owned media objects.
+  const scoped_refptr<RenderMediaLog>& GetMediaLog();
+
   // Stores the WebLocalFrame we are associated with.  This is null from the
   // constructor until BindToWebFrame is called, and it is null after
   // frameDetached is called until destruction (which is asynchronous in the
@@ -1242,6 +1246,8 @@ class CONTENT_EXPORT RenderFrameImpl
   // Destroyed via the RenderFrameObserver::OnDestruct() mechanism.
   UserMediaClientImpl* web_user_media_client_;
 
+  scoped_refptr<RenderMediaLog> media_log_;
+
   // EncryptedMediaClient attached to this frame; lazily initialized.
   std::unique_ptr<media::WebEncryptedMediaClientImpl>
       web_encrypted_media_client_;