Remove Ununsed Input Variable from ScrollAnimator NotifyPosChange

Source/platform/mac/ScrollAnimatorMac.mm

Index: Source/platform/mac/ScrollAnimatorMac.mm
diff --git a/Source/platform/mac/ScrollAnimatorMac.mm b/Source/platform/mac/ScrollAnimatorMac.mm
index f0bde43a649baabcea1125b9f43d88d34a866794..bb2668628c8226cf7034d093c4efe2b1e8bd18dd 100644
--- a/Source/platform/mac/ScrollAnimatorMac.mm
+++ b/Source/platform/mac/ScrollAnimatorMac.mm
@@ -705,7 +705,8 @@ void ScrollAnimatorMac::immediateScrollTo(const FloatPoint& newPosition)
 
     m_currentPosX = adjustedPosition.x();
     m_currentPosY = adjustedPosition.y();
-    notifyPositionChanged(delta);
+    notifyContentAreaScrolled(delta);
+    notifyPositionChanged();
 }
 
 bool ScrollAnimatorMac::isRubberBandInProgress() const
@@ -723,12 +724,6 @@ void ScrollAnimatorMac::immediateScrollToPointForScrollAnimation(const FloatPoin
     immediateScrollTo(newPosition);
 }
 
-void ScrollAnimatorMac::notifyPositionChanged(const FloatSize& delta)
-{
-    notifyContentAreaScrolled(delta);
-    ScrollAnimator::notifyPositionChanged(delta);
-}
-
 void ScrollAnimatorMac::contentAreaWillPaint() const
 {
     if (!scrollableArea()->scrollbarsCanBeActive())
@@ -1141,7 +1136,8 @@ void ScrollAnimatorMac::immediateScrollBy(const FloatSize& delta)
 
     m_currentPosX = newPos.x();
     m_currentPosY = newPos.y();
-    notifyPositionChanged(adjustedDelta);
+    notifyContentAreaScrolled(adjustedDelta);
+    notifyPositionChanged();
 }
 
 void ScrollAnimatorMac::startSnapRubberbandTimer()