cc: Delete unused AnimationCurve::AffectsScale and related code

cc/animation/keyframed_animation_curve.cc

Index: cc/animation/keyframed_animation_curve.cc
diff --git a/cc/animation/keyframed_animation_curve.cc b/cc/animation/keyframed_animation_curve.cc
index 9cc6337a848b57798867e66aab185dad4b19f6d7..762201b7bccbfe17a68e6a5fed5950432705ccbc 100644
--- a/cc/animation/keyframed_animation_curve.cc
+++ b/cc/animation/keyframed_animation_curve.cc
@@ -382,14 +382,6 @@ bool KeyframedTransformAnimationCurve::AnimatedBoundsForBox(
   return true;
 }
 
-bool KeyframedTransformAnimationCurve::AffectsScale() const {
-  for (size_t i = 0; i < keyframes_.size(); ++i) {
-    if (keyframes_[i]->Value().AffectsScale())
-      return true;
-  }
-  return false;
-}
-
 bool KeyframedTransformAnimationCurve::PreservesAxisAlignment() const {
   for (size_t i = 0; i < keyframes_.size(); ++i) {
     if (!keyframes_[i]->Value().PreservesAxisAlignment())