Replace pinch scrollbars with regular scrollbars.

Source/core/frame/VisualViewport.h

Index: Source/core/frame/VisualViewport.h
diff --git a/Source/core/frame/VisualViewport.h b/Source/core/frame/VisualViewport.h
index e1831b29873c518e99eede32574e55f6ba43dc54..41e24aa00ddc7cc0f713cdf2658acd307931ac1c 100644
--- a/Source/core/frame/VisualViewport.h
+++ b/Source/core/frame/VisualViewport.h
@@ -37,14 +37,12 @@
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsLayerClient.h"
 #include "platform/scroll/ScrollableArea.h"
-#include "public/platform/WebScrollbar.h"
 #include "public/platform/WebSize.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 class WebLayerTreeView;
-class WebScrollbarLayer;
 }
 
 namespace blink {
@@ -199,7 +197,6 @@ private:
     void paintContents(const GraphicsLayer*, GraphicsContext&, GraphicsLayerPaintingPhase, const IntRect& inClip) override;
     String debugName(const GraphicsLayer*) override;
 
-    void setupScrollbar(WebScrollbar::Orientation);
     FloatPoint clampOffsetToBoundaries(const FloatPoint&);
 
     LocalFrame* mainFrame() const;
@@ -216,10 +213,6 @@ private:
     OwnPtr<GraphicsLayer> m_overscrollElasticityLayer;
     OwnPtr<GraphicsLayer> m_pageScaleLayer;
     OwnPtr<GraphicsLayer> m_innerViewportScrollLayer;
-    OwnPtr<GraphicsLayer> m_overlayScrollbarHorizontal;
-    OwnPtr<GraphicsLayer> m_overlayScrollbarVertical;
-    OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarHorizontal;
-    OwnPtr<WebScrollbarLayer> m_webOverlayScrollbarVertical;
 
     // Offset of the visual viewport from the main frame's origin, in CSS pixels.
     FloatPoint m_offset;