[LayoutNG] PODify NGLayoutInputNode and sub-classes.

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

Index: third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
index 9c25b24660c515ad6fc3fa4562aa5892f717d2ba..3d090f3471fd0b606f07161b642f5a7d9ab71aef 100644
--- a/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
+++ b/third_party/WebKit/Source/core/layout/ng/layout_ng_block_flow.cc
@@ -23,13 +23,8 @@ void LayoutNGBlockFlow::UpdateBlockLayout(bool relayout_children) {
 
   RefPtr<NGConstraintSpace> constraint_space =
       NGConstraintSpace::CreateFromLayoutObject(*this);
-
-  // TODO(layout-dev): This should be created in the constructor once instead.
-  // There is some internal state which needs to be cleared between layout
-  // passes (probably FirstChild(), etc).
-  box_ = new NGBlockNode(this);
-
-  RefPtr<NGLayoutResult> result = box_->Layout(constraint_space.Get());
+  RefPtr<NGLayoutResult> result =
+      NGBlockNode(this).Layout(constraint_space.Get());
 
   if (IsOutOfFlowPositioned()) {
     // In legacy layout, abspos differs from regular blocks in that abspos
@@ -46,8 +41,8 @@ void LayoutNGBlockFlow::UpdateBlockLayout(bool relayout_children) {
     SetLogicalTop(computed_values.position_);
   }
 
-  for (auto& descendant : result->OutOfFlowDescendants())
-    descendant->UseOldOutOfFlowPositioning();
+  for (NGBlockNode descendant : result->OutOfFlowDescendants())
+    descendant.UseOldOutOfFlowPositioning();
 
   UpdateAfterLayout();
   ClearNeedsLayout();