Replace various ScrollableArea scroll methods with setScrollPosition

Source/platform/mac/ScrollAnimatorMac.h

Index: Source/platform/mac/ScrollAnimatorMac.h
diff --git a/Source/platform/mac/ScrollAnimatorMac.h b/Source/platform/mac/ScrollAnimatorMac.h
index 8d2ff91631396611a1086a17ab93529cc531911a..52fcdd3973ea49b5cc566f06585751c886adfcfc 100644
--- a/Source/platform/mac/ScrollAnimatorMac.h
+++ b/Source/platform/mac/ScrollAnimatorMac.h
@@ -80,7 +80,7 @@ private:
     FloatSize m_contentAreaScrolledTimerScrollDelta;
 
     virtual ScrollResultOneDimensional userScroll(ScrollbarOrientation, ScrollGranularity, float step, float delta) override;
-    virtual void scrollToOffsetWithoutAnimation(const FloatPoint&) override;
+    virtual void scrollToOffsetWithoutAnimation(const FloatPoint&, ScrollType) override;
 
     virtual void handleWheelEventPhase(PlatformWheelEventPhase) override;
 
@@ -115,7 +115,7 @@ private:
 
     FloatPoint adjustScrollPositionIfNecessary(const FloatPoint&) const;
 
-    void immediateScrollTo(const FloatPoint&);
+    void immediateScrollTo(const FloatPoint&, ScrollType);
 
     bool m_haveScrolledSincePageLoad;
     bool m_needsScrollerStyleUpdate;