Make NGFragment to own NGPhysicalFragment

third_party/WebKit/Source/core/layout/ng/ng_physical_fragment_base.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 NGPhysicalFragmentBase_h
 #define NGPhysicalFragmentBase_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_units.h"
 #include "platform/LayoutUnit.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 // The NGPhysicalFragmentBase contains the output information from layout. The
 // fragment stores all of its information in the physical coordinate system for
 // use by paint, hit-testing etc.
 //
 // Layout code should only access output layout information through the
 // NGFragmentBase classes which transforms information into the logical
 // coordinate system.
-class CORE_EXPORT NGPhysicalFragmentBase
-    : public GarbageCollected<NGPhysicalFragmentBase> {
+class CORE_EXPORT NGPhysicalFragmentBase {
  public:
   enum NGFragmentType { FragmentBox = 0, FragmentText = 1 };
 
   NGFragmentType Type() const { return static_cast<NGFragmentType>(type_); }
 
   // The accessors in this class shouldn't be used by layout code directly,
   // instead should be accessed by the NGFragmentBase classes. These accessors
   // exist for paint, hit-testing, etc.
 
   // Returns the border-box size.
@@ skipping 18 matching lines @@
 
   // Should only be used by the parent fragement's layout.
   void SetOffset(NGPhysicalOffset offset) {
     DCHECK(!has_been_placed_);
     offset_ = offset;
     has_been_placed_ = true;
   }
 
   NGMarginStrut MarginStrut() const { return margin_strut_; }
 
-  DEFINE_INLINE_TRACE_AFTER_DISPATCH() {}
-  DECLARE_TRACE();
-
  protected:
   NGPhysicalFragmentBase(NGPhysicalSize size,
                          NGPhysicalSize overflow,
                          NGFragmentType type,
                          NGMarginStrut margin_strut)
       : size_(size),
         overflow_(overflow),
         margin_strut_(margin_strut),
         type_(type),
         has_been_placed_(false) {}
 
   NGPhysicalSize size_;
   NGPhysicalSize overflow_;
   NGPhysicalOffset offset_;
   NGMarginStrut margin_strut_;
 
   unsigned type_ : 1;
   unsigned has_been_placed_ : 1;
 };
 
 }  // namespace blink
 
 #endif  // NGFragmentBase_h