Fix under-invalidation of frame scrollbar on hover

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
index 2aa1d6a89fc471574b4b93481eb73bcc7aed0f9e..dd9579163445e2158cc3154e4c56e16c33636c7d 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
@@ -258,7 +258,6 @@ public:
 
     bool usesCompositedScrolling() const override;
     bool shouldScrollOnMainThread() const override;
-    void scrollControlWasSetNeedsPaintInvalidation() override;
     bool shouldUseIntegerScrollOffset() const override;
     bool isActive() const override;
     bool isScrollCornerVisible() const override;
@@ -489,9 +488,6 @@ private:
         return *m_rareData.get();
     }
 
-    // PaintInvalidationCapableScrollableArea
-    LayoutBox& boxForScrollControlPaintInvalidation() const { return box(); }
-
     PaintLayer& m_layer;
 
     PaintLayer* m_nextTopmostScrollChild;