Remove backface visibility

sky/engine/public/platform/WebLayer.h

Index: sky/engine/public/platform/WebLayer.h
diff --git a/sky/engine/public/platform/WebLayer.h b/sky/engine/public/platform/WebLayer.h
index 27fb93086479c0834f50f5a19eb6598245c9a25b..5282945141cca6a02a87e1d8d9f40c9b2b8a34f6 100644
--- a/sky/engine/public/platform/WebLayer.h
+++ b/sky/engine/public/platform/WebLayer.h
@@ -94,15 +94,6 @@ public:
     // position rather than their tree order.
     virtual void setRenderingContext(int id) = 0;
 
-    // Mark that this layer should use its parent's transform and double-sided
-    // properties in determining this layer's backface visibility instead of
-    // using its own properties. If this property is set, this layer must
-    // have a parent, and the parent may not have this property set.
-    // Note: This API is to work around issues with visibility the handling of
-    // WebKit layers that have a contents layer (canvas, plugin, WebGL, video,
-    // etc).
-    virtual void setUseParentBackfaceVisibility(bool) = 0;
-
     virtual void setBackgroundColor(WebColor) = 0;
     virtual WebColor backgroundColor() const = 0;