Drop unused field from PrototypeInfo

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 6615 matching lines @@
   // [validity_cell]: Cell containing the validity bit for prototype chains
   // going through this object, or Smi(0) if uninitialized.
   DECL_ACCESSORS(validity_cell, Object)
 
   DECLARE_CAST(PrototypeInfo)
 
   // Dispatched behavior.
   DECLARE_PRINTER(PrototypeInfo)
   DECLARE_VERIFIER(PrototypeInfo)
 
-  static const int kPrototypeObjectOffset = HeapObject::kHeaderSize;
-  static const int kPrototypeUsersOffset =
-      kPrototypeObjectOffset + kPointerSize;
+  static const int kPrototypeUsersOffset = HeapObject::kHeaderSize;
   static const int kValidityCellOffset = kPrototypeUsersOffset + kPointerSize;
   static const int kSize = kValidityCellOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PrototypeInfo);
 };
 
 
 // Script describes a script which has been added to the VM.
 class Script: public Struct {
@@ skipping 4440 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_