cc: De-special-case SurfaceLayer code

cc/layers/surface_layer.h

Index: cc/layers/surface_layer.h
diff --git a/cc/layers/surface_layer.h b/cc/layers/surface_layer.h
index 43f2f107f307db9bb9044297eb306af60a7303a6..d6d3f218f1af039aa9d928b0411ecb5ff16d638e 100644
--- a/cc/layers/surface_layer.h
+++ b/cc/layers/surface_layer.h
@@ -52,12 +52,8 @@ class CC_EXPORT SurfaceLayer : public Layer {
  private:
   ~SurfaceLayer() override;
   void RemoveReference(base::Closure reference_returner);
-  void AddReferencedSurfaceId(const SurfaceInfo& surface_info);
-  void RemoveReferencedSurfaceId(const SurfaceInfo& surface_info);
 
   SurfaceInfo primary_surface_info_;
-  base::Closure primary_reference_returner_;
-
   SurfaceInfo fallback_surface_info_;
   base::Closure fallback_reference_returner_;