Make NGFragment to own NGPhysicalFragment

third_party/WebKit/Source/core/layout/ng/ng_physical_constraint_space.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 NGPhysicalConstraintSpace_h
 #define NGPhysicalConstraintSpace_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_units.h"
 #include "platform/heap/Handle.h"
@@ skipping 36 matching lines @@
                           rect.location.top.toString().ascii().data(),
                           rect.size.width.toString().ascii().data(),
                           rect.size.height.toString().ascii().data());
   }
   NGPhysicalRect rect;
 };
 
 // The NGPhysicalConstraintSpace contains the underlying data for the
 // NGConstraintSpace. It is not meant to be used directly as all members are in
 // the physical coordinate space. Instead NGConstraintSpace should be used.
-class CORE_EXPORT NGPhysicalConstraintSpace final

[cbiesinger, 2016/09/26 17:17:55]

Why remove the final?

-    : public GarbageCollectedFinalized<NGPhysicalConstraintSpace> {
+class CORE_EXPORT NGPhysicalConstraintSpace {
  public:
   NGPhysicalConstraintSpace();
   NGPhysicalConstraintSpace(NGPhysicalSize);
-  NGPhysicalConstraintSpace(const NGPhysicalConstraintSpace&);
+
+  ~NGPhysicalConstraintSpace() = default;
 
   NGPhysicalSize ContainerSize() const { return container_size_; }
 
   void AddExclusion(const NGExclusion, unsigned options = 0);
   const Vector<NGExclusion>& Exclusions(unsigned options = 0) const;
 
-  DEFINE_INLINE_TRACE() {}
-
  private:
   friend class NGConstraintSpace;
 
   NGPhysicalSize container_size_;
 
   unsigned fixed_width_ : 1;
   unsigned fixed_height_ : 1;
   unsigned width_direction_triggers_scrollbar_ : 1;
   unsigned height_direction_triggers_scrollbar_ : 1;
   unsigned width_direction_fragmentation_type_ : 2;
   unsigned height_direction_fragmentation_type_ : 2;
 
   Vector<NGExclusion> exclusions_;
 };
 
 }  // namespace blink
 
 #endif  // NGPhysicalConstraintSpace_h