Only not take zOffset into account during hit-testing when child layers are in the same 3d renderin…

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 820535bab6ef49aac21abc5b3baf36b0dc17e717..fa9730c9fe7fe0fc99459763b87c8ab4068e40db 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -2668,11 +2668,6 @@ RenderLayer* RenderLayer::hitTestLayer(RenderLayer* rootLayer, RenderLayer* cont
         // Our layers can depth-test with our container, so share the z depth pointer with the container, if it passed one down.
         zOffsetForDescendantsPtr = zOffset ? zOffset : &localZOffset;
         zOffsetForContentsPtr = zOffset ? zOffset : &localZOffset;
-    } else if (m_has3DTransformedDescendant) {
-        // Flattening layer with 3d children; use a local zOffset pointer to depth-test children and foreground.
-        depthSortDescendants = true;
-        zOffsetForDescendantsPtr = zOffset ? zOffset : &localZOffset;
-        zOffsetForContentsPtr = zOffset ? zOffset : &localZOffset;
     } else if (zOffset) {
         zOffsetForDescendantsPtr = 0;
         // Container needs us to give back a z offset for the hit layer.