Replace various ScrollableArea scroll methods with setScrollPosition

Source/web/RotationViewportAnchor.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "web/RotationViewportAnchor.h"
 
 #include "core/dom/ContainerNode.h"
 #include "core/dom/Node.h"
 #include "core/frame/FrameView.h"
@@ skipping 142 matching lines @@
     newPageScaleFactor = m_pageScaleConstraintsSet.finalConstraints().clampToConstraints(newPageScaleFactor);
 
     FloatSize pinchViewportSize = m_pinchViewport->size();
     pinchViewportSize.scale(1 / newPageScaleFactor);
 
     IntPoint mainFrameOrigin;
     FloatPoint pinchViewportOrigin;
 
     computeOrigins(pinchViewportSize, mainFrameOrigin, pinchViewportOrigin);
 
-    m_rootFrameView->setScrollOffset(mainFrameOrigin);
+    m_rootFrameView->setScrollPosition(mainFrameOrigin, ProgrammaticScroll);
 
     // Set scale before location, since location can be clamped on setting scale.
     m_pinchViewport->setScale(newPageScaleFactor);
     m_pinchViewport->setLocation(pinchViewportOrigin);
 }
 
 void RotationViewportAnchor::computeOrigins(const FloatSize& innerSize, IntPoint& mainFrameOffset, FloatPoint& pinchViewportOffset) const
 {
     IntSize outerSize = m_rootFrameView->visibleContentRect().size();
 
@@ skipping 31 matching lines @@
     anchorOffsetFromNode.scale(m_anchorInNodeCoords.width(), m_anchorInNodeCoords.height());
     FloatPoint anchorPoint = FloatPoint(currentNodeBounds.location()) + anchorOffsetFromNode;
 
     // Compute the new origin point relative to the new anchor point
     FloatSize anchorOffsetFromOrigin = innerSize;
     anchorOffsetFromOrigin.scale(m_anchorInInnerViewCoords.width(), m_anchorInInnerViewCoords.height());
     return anchorPoint - anchorOffsetFromOrigin;
 }
 
 } // namespace blink