Cleanup FreeSpace: Remove getter for address of next pointer

src/objects.h

 // Copyright 2012 the V8 project 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 V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 4382 matching lines @@
   inline int size() const;
   inline void set_size(int value);
 
   inline int nobarrier_size() const;
   inline void nobarrier_set_size(int value);
 
   inline int Size();
 
   // Accessors for the next field.
   inline FreeSpace* next();
-  inline FreeSpace** next_address();
   inline void set_next(FreeSpace* next);
 
   inline static FreeSpace* cast(HeapObject* obj);
 
   // Dispatched behavior.
   DECLARE_PRINTER(FreeSpace)
   DECLARE_VERIFIER(FreeSpace)
 
   // Layout description.
   // Size is smi tagged when it is stored.
@@ skipping 6372 matching lines @@
   // (elements + properties) in the current level.
   int levelLength_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
 };
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_