[LayoutNG] PODify NGLayoutInputNode and sub-classes.

third_party/WebKit/Source/core/layout/ng/inline/ng_text_fragment_builder.h

 // Copyright 2017 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.
 
 #ifndef NGTextFragmentBuilder_h
 #define NGTextFragmentBuilder_h
 
 #include "core/layout/ng/geometry/ng_logical_size.h"
+#include "core/layout/ng/inline/ng_inline_node.h"
 #include "core/layout/ng/inline/ng_line_height_metrics.h"
 #include "platform/text/TextDirection.h"
 #include "platform/wtf/Allocator.h"
 
 namespace blink {
 
-class NGInlineNode;
 class NGPhysicalTextFragment;
 
 class CORE_EXPORT NGTextFragmentBuilder final {
   STACK_ALLOCATED();
 
  public:
-  NGTextFragmentBuilder(NGInlineNode*);
+  NGTextFragmentBuilder(NGInlineNode);
 
   NGTextFragmentBuilder& SetDirection(TextDirection);
 
   NGTextFragmentBuilder& SetSize(const NGLogicalSize&);
 
   void UniteMetrics(const NGLineHeightMetrics&);
   const NGLineHeightMetrics& Metrics() const { return metrics_; }
 
   // Creates the fragment. Can only be called once.
   RefPtr<NGPhysicalTextFragment> ToTextFragment(unsigned index,
                                                 unsigned start_offset,
                                                 unsigned end_offset);
 
  private:
   TextDirection direction_;
 
-  Persistent<NGInlineNode> node_;
+  NGInlineNode node_;
 
   NGLogicalSize size_;
 
   NGLineHeightMetrics metrics_;
 };
 
 }  // namespace blink
 
 #endif  // NGTextFragmentBuilder