cc: Remove usage of ComputeVisibleRects on main thread

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 560e3e77d5db245352fc916b0041b1ebb420eaee..eaba892bda1494519b01bc73cfa6df24d3ab6eaf 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -430,10 +430,6 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
   void SetEffectTreeIndex(int index);
   int effect_tree_index() const;
 
-  // TODO(sunxd): Remove this when we do not compute target space transforms on
-  // main thread in tests.
-  int render_target_effect_tree_index() const;
-
   void SetScrollTreeIndex(int index);
   int scroll_tree_index() const;