Revert of Invalidate scrolling contents on scrolling contents layer only

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
index 411183ed1f7cda4b7d6a3066e1bf6ce26024b8a9..4532b25d141f0be74dd9bc448abc90db4e2be085 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBoxModelObject.cpp
@@ -413,13 +413,7 @@ void LayoutBoxModelObject::invalidateDisplayItemClientOnBacking(const DisplayIte
             squashingLayer->invalidateDisplayItemClient(displayItemClient, invalidationReason, paintInvalidationRect ? &paintInvalidationRectOnSquashingLayer : nullptr);
         }
     } else if (CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping()) {
-        if (this != &displayItemClient && isBox() && toLayoutBox(this)->usesCompositedScrolling()) {
-            // This paint invalidation container is using composited scrolling, and we are invalidating a scrolling content,
-            // so we should invalidate on the scrolling contents layer only.
-            compositedLayerMapping->invalidateDisplayItemClientOnScrollingContentsLayer(displayItemClient, invalidationReason, paintInvalidationRect);
-        } else {
-            compositedLayerMapping->invalidateDisplayItemClient(displayItemClient, invalidationReason, paintInvalidationRect);
-        }
+        compositedLayerMapping->invalidateDisplayItemClient(displayItemClient, invalidationReason, paintInvalidationRect);
     }
 }