RenderLayerScrollableArea::updateScrollCornerStyle shouldn't do work if we're using overlay scrollb…

Source/core/rendering/RenderLayerScrollableArea.cpp

Index: Source/core/rendering/RenderLayerScrollableArea.cpp
diff --git a/Source/core/rendering/RenderLayerScrollableArea.cpp b/Source/core/rendering/RenderLayerScrollableArea.cpp
index 82ca8532c9a99d4b8449bf055e41d00f6aa71b64..9eae1fb6c6c18d68726b43b7b8b3203382d2101e 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -601,6 +601,9 @@ void RenderLayerScrollableArea::updateAfterLayout()
         if (m_box->hasAutoVerticalScrollbar())
             setHasVerticalScrollbar(hasVerticalOverflow);
 
+        if (hasVerticalOverflow || hasHorizontalOverflow)
+            updateScrollCornerStyle();
+
         layer()->updateSelfPaintingLayer();
 
         // Force an update since we know the scrollbars have changed things.
@@ -958,6 +961,11 @@ bool RenderLayerScrollableArea::scrollsOverflow() const
 
 void RenderLayerScrollableArea::updateScrollCornerStyle()
 {
+    if (!m_scrollCorner && !hasScrollbar())
+        return;
+    if (!m_scrollCorner && hasOverlayScrollbars())
+        return;
+
     RenderObject* actualRenderer = rendererForScrollbar(m_box);
     RefPtr<RenderStyle> corner = m_box->hasOverflowClip() ? actualRenderer->getUncachedPseudoStyle(PseudoStyleRequest(SCROLLBAR_CORNER), actualRenderer->style()) : PassRefPtr<RenderStyle>(nullptr);
     if (corner) {