[LayoutNG] PODify NGLayoutInputNode and sub-classes.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/layout_ng_block_flow.h"
 
 #include "core/layout/LayoutAnalyzer.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_fragment.h"
 #include "core/layout/ng/ng_layout_result.h"
 
 namespace blink {
 
 LayoutNGBlockFlow::LayoutNGBlockFlow(Element* element)
     : LayoutBlockFlow(element) {}
 
 bool LayoutNGBlockFlow::IsOfType(LayoutObjectType type) const {
   return type == kLayoutObjectNGBlockFlow || LayoutBlockFlow::IsOfType(type);
 }
 
 void LayoutNGBlockFlow::UpdateBlockLayout(bool relayout_children) {
   LayoutAnalyzer::BlockScope analyzer(*this);
 
   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
     // blocks position themselves in their own layout, instead of getting
     // positioned by their parent. So it we are a positioned block in a legacy-
     // layout containing block, we have to emulate this positioning.
     // Additionally, until we natively support abspos in LayoutNG, this code
     // will also be reached though the layoutPositionedObjects call in
     // NGBlockNode::CopyFragmentDataToLayoutBox.
     LogicalExtentComputedValues computed_values;
     ComputeLogicalWidth(computed_values);
     SetLogicalLeft(computed_values.position_);
     ComputeLogicalHeight(LogicalHeight(), LogicalTop(), computed_values);
     SetLogicalTop(computed_values.position_);
   }
 
-  for (auto& descendant : result->OutOfFlowDescendants())
-    descendant->UseOldOutOfFlowPositioning();
+  for (NGBlockNode descendant : result->OutOfFlowDescendants())
+    descendant.UseOldOutOfFlowPositioning();
 
   UpdateAfterLayout();
   ClearNeedsLayout();
 }
 
 NGInlineNodeData& LayoutNGBlockFlow::GetNGInlineNodeData() const {
   DCHECK(ng_inline_node_data_);
   return *ng_inline_node_data_.get();
 }
 
 void LayoutNGBlockFlow::ResetNGInlineNodeData() {
   ng_inline_node_data_ = WTF::MakeUnique<NGInlineNodeData>();
 }
 
 }  // namespace blink