Replace various ScrollableArea scroll methods with setScrollPosition

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 8e4577287c9281addc5e034d9e6a201faaf0d465..5fe1559a21138ce6160c38a717a980e205d58b6b 100644
--- a/Source/platform/mac/ScrollAnimatorMac.mm
+++ b/Source/platform/mac/ScrollAnimatorMac.mm
@@ -726,10 +726,10 @@ ScrollResultOneDimensional ScrollAnimatorMac::userScroll(ScrollbarOrientation or
     return ScrollResultOneDimensional(true, delta - usedDelta);
 }
 
-void ScrollAnimatorMac::scrollToOffsetWithoutAnimation(const FloatPoint& offset)
+void ScrollAnimatorMac::scrollToOffsetWithoutAnimation(const FloatPoint& offset, ScrollType scrollType)
 {
     [m_scrollAnimationHelper.get() _stopRun];
-    immediateScrollTo(offset);
+    immediateScrollTo(offset, scrollType);
 }
 
 FloatPoint ScrollAnimatorMac::adjustScrollPositionIfNecessary(const FloatPoint& position) const
@@ -746,7 +746,7 @@ FloatPoint ScrollAnimatorMac::adjustScrollPositionIfNecessary(const FloatPoint&
     return FloatPoint(newX, newY);
 }
 
-void ScrollAnimatorMac::immediateScrollTo(const FloatPoint& newPosition)
+void ScrollAnimatorMac::immediateScrollTo(const FloatPoint& newPosition, ScrollType scrollType)
 {
     FloatPoint adjustedPosition = adjustScrollPositionIfNecessary(newPosition);
 
@@ -759,7 +759,7 @@ void ScrollAnimatorMac::immediateScrollTo(const FloatPoint& newPosition)
     m_currentPosX = adjustedPosition.x();
     m_currentPosY = adjustedPosition.y();
     notifyContentAreaScrolled(delta);
-    notifyPositionChanged();
+    notifyPositionChanged(scrollType);
 }
 
 void ScrollAnimatorMac::contentAreaWillPaint() const