Don't paint empty scroll corner

third_party/WebKit/Source/core/paint/FramePainter.cpp

Index: third_party/WebKit/Source/core/paint/FramePainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/FramePainter.cpp b/third_party/WebKit/Source/core/paint/FramePainter.cpp
index 803658d1e311043c179fa70455337b9858a72af5..dad69700113834beb63a0f3a560e64801972239d 100644
--- a/third_party/WebKit/Source/core/paint/FramePainter.cpp
+++ b/third_party/WebKit/Source/core/paint/FramePainter.cpp
@@ -206,8 +206,10 @@ void FramePainter::PaintScrollbars(GraphicsContext& context,
       !GetFrameView().LayerForVerticalScrollbar())
     PaintScrollbar(context, *GetFrameView().VerticalScrollbar(), rect);
 
-  if (GetFrameView().LayerForScrollCorner())
+  if (GetFrameView().LayerForScrollCorner() ||
+      !GetFrameView().IsScrollCornerVisible()) {
     return;
+  }
 
   PaintScrollCorner(context, GetFrameView().ScrollCornerRect());
 }