cc : Delete code not used outside tests related to impl-only animations

cc/animation/animation_host.h

Index: cc/animation/animation_host.h
diff --git a/cc/animation/animation_host.h b/cc/animation/animation_host.h
index 5839d599753d50fd138162b541bd1618cb1b4c3a..976122702cbd9ff8512d9285b3b7bc037d8ecbbe 100644
--- a/cc/animation/animation_host.h
+++ b/cc/animation/animation_host.h
@@ -108,10 +108,7 @@ class CC_EXPORT AnimationHost {
   bool HasAnyAnimationTargetingProperty(ElementId element_id,
                                         TargetProperty::Type property) const;
 
-  bool FilterIsAnimatingOnImplOnly(ElementId element_id) const;
-  bool OpacityIsAnimatingOnImplOnly(ElementId element_id) const;
   bool ScrollOffsetIsAnimatingOnImplOnly(ElementId element_id) const;
-  bool TransformIsAnimatingOnImplOnly(ElementId element_id) const;
 
   bool HasFilterAnimationThatInflatesBounds(ElementId element_id) const;
   bool HasTransformAnimationThatInflatesBounds(ElementId element_id) const;