exo: Replace fling cancel with generic zero distance scroll

components/exo/pointer_delegate.h

Index: components/exo/pointer_delegate.h
diff --git a/components/exo/pointer_delegate.h b/components/exo/pointer_delegate.h
index 7e4e4fa2350f4a9a5b0dcc20473ba53321dc183e..cbfc718fff8ab1959c706dfa916652874fcf554b 100644
--- a/components/exo/pointer_delegate.h
+++ b/components/exo/pointer_delegate.h
@@ -56,9 +56,6 @@ class PointerDelegate {
                                const gfx::Vector2dF& offset,
                                bool discrete) = 0;
 
-  // Called when a current kinetic scroll should be canceled.
-  virtual void OnPointerScrollCancel(base::TimeTicks time_stamp) = 0;
-
   // Called when pointer scroll has stopped and a fling is happening (e.g.
   // lifting the fingers from the touchpad after scrolling quickly)
   virtual void OnPointerScrollStop(base::TimeTicks time_stamp) = 0;