[LayoutNG] Make NG algorithms non-oilpan.

third_party/WebKit/Source/core/layout/ng/ng_inline_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"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ComputedStyle;
 class LayoutObject;
-class NGBreakToken;
 class NGConstraintSpace;
 class NGFragmentBuilder;
 class NGInlineNode;
 
 // A class for inline layout (e.g. a anonymous block with inline-level children
 // only).
 //
 // This algorithm may at some point be merged with NGBlockLayoutAlgorithm in
 // the future. Currently it exists as its own class to simplify the LayoutNG
 // transition period.
 class CORE_EXPORT NGInlineLayoutAlgorithm : public NGLayoutAlgorithm {
  public:
   // Default constructor.
   // @param layout_object The LayoutObject associated with this anonymous block.
   // @param style Style reference of the block that is being laid out.
   // @param first_child Our first child; the algorithm will use its NextSibling
   //                    method to access all the children.
   // @param space The constraint space which the algorithm should generate a
   //              fragment within.
   NGInlineLayoutAlgorithm(LayoutObject* layout_object,
                           PassRefPtr<const ComputedStyle> style,
                           NGInlineNode* first_child,
                           NGConstraintSpace* space,
                           NGBreakToken* break_token = nullptr);
 
   NGPhysicalFragment* Layout() override;
 
-  DECLARE_VIRTUAL_TRACE();
-
  private:
   // Read-only Getters.
   const ComputedStyle& Style() const { return *style_; }
 
   NGConstraintSpace* CreateConstraintSpaceForChild(const NGInlineNode&) const;
 
   RefPtr<const ComputedStyle> style_;
-  Member<NGInlineNode> first_child_;
-  Member<NGConstraintSpace> constraint_space_;
-  Member<NGBreakToken> break_token_;
-  Member<NGFragmentBuilder> builder_;
+  Persistent<NGInlineNode> first_child_;
+  Persistent<NGConstraintSpace> constraint_space_;
+  Persistent<NGBreakToken> break_token_;
+  Persistent<NGFragmentBuilder> builder_;
 };
 
 }  // namespace blink
 
 #endif  // NGInlineLayoutAlgorithm_h