Remove Layer{Impl}::FilterIsAnimating.

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index a2357298fa9fa7afb9014218e5483c80c456e6f3..10bc5221ba4178374d50804f71c4d22b8475484a 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -1301,11 +1301,6 @@ void Layer::SetScrollbarsHiddenFromImplSide(bool hidden) {
     inputs_.client->didChangeScrollbarsHidden(hidden);
 }
 
-bool Layer::FilterIsAnimating() const {
-  return GetMutatorHost()->IsAnimatingFilterProperty(
-      element_id(), GetElementTypeForAnimation());
-}
-
 bool Layer::TransformIsAnimating() const {
   return GetMutatorHost()->IsAnimatingTransformProperty(
       element_id(), GetElementTypeForAnimation());