[LayoutNG] PODify NGLayoutInputNode and sub-classes.

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

 // 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.
 
 #ifndef NGPhysicalTextFragment_h
 #define NGPhysicalTextFragment_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/inline/ng_inline_node.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_physical_fragment.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class CORE_EXPORT NGPhysicalTextFragment final : public NGPhysicalFragment {
  public:
   NGPhysicalTextFragment(LayoutObject* layout_object,
-                         const NGInlineNode* node,
+                         const NGInlineNode node,
                          unsigned item_index,
                          unsigned start_offset,
                          unsigned end_offset,
                          NGPhysicalSize size)
       : NGPhysicalFragment(layout_object, size, kFragmentText),
         node_(node),
         item_index_(item_index),
         start_offset_(start_offset),
         end_offset_(end_offset) {}
 
-  const NGInlineNode* Node() const { return node_; }
-  StringView Text() const { return node_->Text(start_offset_, end_offset_); }
+  const NGInlineNode Node() const { return node_; }
+  StringView Text() const { return node_.Text(start_offset_, end_offset_); }
 
   // The range of NGLayoutInlineItem.
   unsigned ItemIndex() const { return item_index_; }
   unsigned StartOffset() const { return start_offset_; }
   unsigned EndOffset() const { return end_offset_; }
 
  private:
   // TODO(kojii): NGInlineNode is to access text content and NGLayoutInlineItem.
   // Review if it's better to point them.
-  Persistent<const NGInlineNode> node_;
+  const NGInlineNode node_;
   unsigned item_index_;
   unsigned start_offset_;
   unsigned end_offset_;
 };
 
 DEFINE_TYPE_CASTS(NGPhysicalTextFragment,
                   NGPhysicalFragment,
                   fragment,
                   fragment->IsText(),
                   fragment.IsText());
 
 }  // namespace blink
 
 #endif  // NGPhysicalTextFragment_h