[ash-md] Remove the number of animators used for the Shelf animations.

ui/gfx/animation/slide_animation.h

Index: ui/gfx/animation/slide_animation.h
diff --git a/ui/gfx/animation/slide_animation.h b/ui/gfx/animation/slide_animation.h
index 9023d40c86f3de320cdc089d497347af363421fd..02ebda7c59d4cf94aeaeca0f8f4bed74ab8da377 100644
--- a/ui/gfx/animation/slide_animation.h
+++ b/ui/gfx/animation/slide_animation.h
@@ -68,6 +68,10 @@ class GFX_EXPORT SlideAnimation : public LinearAnimation {
   void SetTweenType(Tween::Type tween_type) { tween_type_ = tween_type; }
 
   double GetCurrentValue() const override;
+  // TODO(bruthig): Fix IsShowing() and IsClosing() to be consistent. e.g.
+  // IsShowing() will currently return true after the 'show' animation has been
+  // completed however IsClosing() will return false after the 'hide' animation
+  // has been completed.
   bool IsShowing() const { return showing_; }
   bool IsClosing() const { return !showing_ && value_end_ < value_current_; }