[LayoutNG] Make NG algorithms non-oilpan.

third_party/WebKit/Source/core/layout/ng/ng_block_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 NGBlockLayoutAlgorithm_h
 #define NGBlockLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_box_fragment.h"
+#include "core/layout/ng/ng_break_token.h"
+#include "core/layout/ng/ng_column_mapper.h"
 #include "core/layout/ng/ng_layout_algorithm.h"
 #include "core/layout/ng/ng_units.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ComputedStyle;
 class NGBlockBreakToken;
-class NGBreakToken;
-class NGColumnMapper;
 class NGConstraintSpace;
 class NGConstraintSpaceBuilder;
 class NGFragment;
 class NGFragmentBuilder;
 class NGPhysicalFragment;
 
 // A class for general block layout (e.g. a <div> with no special style).
 // Lays out the children in sequence.
 class CORE_EXPORT NGBlockLayoutAlgorithm : public NGLayoutAlgorithm {
  public:
   // Default constructor.
   // @param layout_object The layout object associated with this 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.
   NGBlockLayoutAlgorithm(LayoutObject* layout_object,
                          PassRefPtr<const ComputedStyle> style,
                          NGBlockNode* first_child,
                          NGConstraintSpace* space,
                          NGBreakToken* break_token = nullptr);
 
   bool ComputeMinAndMaxContentSizes(MinAndMaxContentSizes*) const override;
   NGPhysicalFragment* Layout() override;
 
-  DECLARE_VIRTUAL_TRACE();
-
  private:
   NGBoxStrut CalculateMargins(const NGConstraintSpace& space,
                               const ComputedStyle& style);
 
   // Creates a new constraint space for the current child.
   NGConstraintSpace* CreateConstraintSpaceForCurrentChild();
   void FinishCurrentChildLayout(NGFragment* fragment);
 
   // Proceed to the next sibling that still needs layout.
   //
@@ skipping 57 matching lines @@
   }
 
   const NGConstraintSpace& CurrentChildConstraintSpace() const {
     return *space_for_current_child_.get();
   }
 
   const ComputedStyle& Style() const { return *style_; }
 
   RefPtr<const ComputedStyle> style_;
 
-  Member<NGBlockNode> first_child_;
-  Member<NGConstraintSpace> constraint_space_;
+  Persistent<NGBlockNode> first_child_;
+  Persistent<NGConstraintSpace> constraint_space_;
 
   // The break token from which we are currently resuming layout.
-  Member<NGBreakToken> break_token_;
+  Persistent<NGBreakToken> break_token_;
 
-  Member<NGFragmentBuilder> builder_;
-  Member<NGConstraintSpaceBuilder> space_builder_;
-  Member<NGConstraintSpace> space_for_current_child_;
-  Member<NGBlockNode> current_child_;
+  Persistent<NGFragmentBuilder> builder_;
+  Persistent<NGConstraintSpaceBuilder> space_builder_;
+  Persistent<NGConstraintSpace> space_for_current_child_;
+  Persistent<NGBlockNode> current_child_;
 
   // Mapper from the fragmented flow coordinate space coordinates to visual
   // coordinates. Only set on fragmentation context roots, such as multicol
   // containers. Keeps track of the current fragmentainer.
-  Member<NGColumnMapper> fragmentainer_mapper_;
+  Persistent<NGColumnMapper> fragmentainer_mapper_;
 
   NGBoxStrut border_and_padding_;
   LayoutUnit content_size_;
   LayoutUnit max_inline_size_;
   // MarginStrut for the previous child.
   NGMarginStrut curr_margin_strut_;
   NGLogicalOffset bfc_offset_;
   NGLogicalOffset curr_bfc_offset_;
   NGBoxStrut curr_child_margins_;
 };
 
 }  // namespace blink
 
 #endif  // NGBlockLayoutAlgorithm_h