Let LayoutNG handle childless block flows.

third_party/WebKit/Source/core/layout/ng/ng_box.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_box.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_box.cc b/third_party/WebKit/Source/core/layout/ng/ng_box.cc
index 026d7bde3f958322c119b0cb8ed96425fa6dd9bc..d8085c90e7ec7dddb05805c0d512fa0f77bdacd7 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_box.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_box.cc
@@ -132,8 +132,9 @@ void NGBox::PositionUpdated() {
 bool NGBox::CanUseNewLayout() {
   if (!layout_box_)
     return true;
-  if (layout_box_->isLayoutBlockFlow() && !layout_box_->childrenInline())
-    return true;
-  return false;
+  if (!layout_box_->isLayoutBlockFlow())
+    return false;
+  const LayoutBlockFlow* block_flow = toLayoutBlockFlow(layout_box_);
+  return !block_flow->childrenInline() || !block_flow->firstChild();
 }
 }  // namespace blink