Need to invalidate scrollbars in case they get repositioned.

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index ce25fed67457deff786589aa5aba66d772b451ad..9316951059e675e8493730ef13d9effcbb3325a2 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -694,6 +694,8 @@ protected:
     virtual PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&, const LayoutLayerModelObject& newPaintInvalidationContainer) override;
     virtual void invalidateDisplayItemClients(DisplayItemList*) const override;
 
+    virtual bool hasNonCompositedScrollbars() const final;

[dsinclair, 2015/02/23 15:13:53]

Should this be override instead of virtual?

[mstensho (USE GERRIT), 2015/02/23 17:22:38]

It's already a final override (there's a call site from RenderBox, so making it
final should save a few CPU cycles). Should I drop the "virtual" keyword, or
what did you mean? Everyone else around here repeat "virtual" on overrides, so I
thought it would look weird and special to omit it.

+
 private:
     void updateShapeOutsideInfoAfterStyleChange(const LayoutStyle&, const LayoutStyle* oldStyle);
     void updateGridPositionAfterStyleChange(const LayoutStyle*);
@@ -756,8 +758,6 @@ private:
 
     void inflatePaintInvalidationRectForReflectionAndFilter(LayoutRect&) const;
 
-    bool hasNonCompositedScrollbars() const;
-
     LayoutRectOutsets m_marginBoxOutsets;
 
 protected: