Don't call DirtyStackingContextZOrderLists during document shutdown

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

Index: third_party/WebKit/Source/core/paint/PaintLayer.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayer.cpp b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
index 1f9148f70c35bc50321b277d0a6b01410f2b6fb7..16f625873668c322d216058212ebb91e6e3d0ab5 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayer.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayer.cpp
@@ -1303,18 +1303,19 @@ PaintLayer* PaintLayer::RemoveChild(PaintLayer* old_child) {
   if (last_ == old_child)
     last_ = old_child->PreviousSibling();
 
-  if (Compositor()) {
-    if (!old_child->StackingNode()->IsStacked() &&
-        !GetLayoutObject().DocumentBeingDestroyed())
-      Compositor()->SetNeedsCompositingUpdate(kCompositingUpdateRebuildTree);
-  }
+  if (!GetLayoutObject().DocumentBeingDestroyed()) {
+    if (Compositor()) {
+      if (!old_child->StackingNode()->IsStacked())
+        Compositor()->SetNeedsCompositingUpdate(kCompositingUpdateRebuildTree);
+    }
 
-  if (old_child->StackingNode()->IsStacked() || old_child->FirstChild()) {
-    // Dirty the z-order list in which we are contained.  When called via the
-    // reattachment process in removeOnlyThisLayer, the layer may already be
-    // disconnected from the main layer tree, so we need to null-check the
-    // |stackingContext| value.
-    old_child->StackingNode()->DirtyStackingContextZOrderLists();
+    if (old_child->StackingNode()->IsStacked() || old_child->FirstChild()) {
+      // Dirty the z-order list in which we are contained.  When called via the
+      // reattachment process in removeOnlyThisLayer, the layer may already be
+      // disconnected from the main layer tree, so we need to null-check the
+      // |stackingContext| value.
+      old_child->StackingNode()->DirtyStackingContextZOrderLists();
+    }
   }
 
   if (GetLayoutObject().Style()->Visibility() != EVisibility::kVisible)