[LayoutNG] PODify NGLayoutInputNode and sub-classes.

third_party/WebKit/Source/core/layout/ng/ng_break_token.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 NGBreakToken_h
 #define NGBreakToken_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_layout_input_node.h"
 #include "platform/heap/Handle.h"
@@ skipping 30 matching lines @@
   bool IsBlockType() const { return Type() == kBlockBreakToken; }
   bool IsInlineType() const { return Type() == kInlineBreakToken; }
 
   enum NGBreakTokenStatus { kUnfinished, kFinished };
 
   // Whether the layout node cannot produce any more fragments.
   bool IsFinished() const { return status_ == kFinished; }
 
   // Returns the node associated with this break token. A break token cannot be
   // used with any other node.
-  NGLayoutInputNode* InputNode() const { return node_; }
+  NGLayoutInputNode InputNode() const { return node_; }
 
  protected:
   NGBreakToken(NGBreakTokenType type,
                NGBreakTokenStatus status,
-               NGLayoutInputNode* node)
+               NGLayoutInputNode node)
       : type_(type), status_(status), node_(node) {}
 
  private:
   unsigned type_ : 1;
   unsigned status_ : 1;
 
-  Persistent<NGLayoutInputNode> node_;
+  NGLayoutInputNode node_;
 };
 
 }  // namespace blink
 
 #endif  // NGBreakToken_h