[LayoutNG] Make NG algorithms non-oilpan.

third_party/WebKit/Source/core/layout/ng/ng_text_layout_algorithm.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 NGInlineLayoutAlgorithm_h
 #define NGInlineLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
+#include "core/layout/ng/ng_break_token.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
-class NGBreakToken;
 class NGConstraintSpace;
 class NGInlineNode;
 class NGLineBuilder;
 
 // A class for text layout. This takes a NGInlineNode which consists only
 // non-atomic inlines and produces NGTextFragments.
 //
 // Unlike other layout algorithms this takes a NGInlineNode as its input instead
 // of the ComputedStyle as it operates over multiple inlines with different
 // style.
 class CORE_EXPORT NGTextLayoutAlgorithm : public NGLayoutAlgorithm {
  public:
   // Default constructor.
   // @param inline_box The inline box to produce fragments from.
   // @param space The constraint space which the algorithm should generate a
   //              fragments within.
   NGTextLayoutAlgorithm(NGInlineNode* inline_box,
                         NGConstraintSpace* space,
                         NGBreakToken* break_token = nullptr);
 
   NGPhysicalFragment* Layout() override;
   void LayoutInline(NGLineBuilder*);
 
-  DECLARE_VIRTUAL_TRACE();
-
  private:
-  Member<NGInlineNode> inline_box_;
-  Member<NGConstraintSpace> constraint_space_;
-  Member<NGBreakToken> break_token_;
+  Persistent<NGInlineNode> inline_box_;
+  Persistent<NGConstraintSpace> constraint_space_;
+  Persistent<NGBreakToken> break_token_;
 
   friend class NGInlineNodeTest;
 };
 
-DEFINE_TYPE_CASTS(NGTextLayoutAlgorithm,
-                  NGLayoutAlgorithm,
-                  algorithm,
-                  algorithm->algorithmType() == kTextLayoutAlgorithm,
-                  algorithm.algorithmType() == kTextLayoutAlgorithm);
-
 }  // namespace blink
 
 #endif  // NGInlineLayoutAlgorithm_h