Remove custom left overs from object grouping

third_party/WebKit/Source/bindings/core/v8/SharedPersistent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
                                                 v8::Isolate* isolate) {
     return adoptRef(new SharedPersistent<T>(value, isolate));
   }
 
   v8::Local<T> newLocal(v8::Isolate* isolate) const {
     return m_value.newLocal(isolate);
   }
 
   bool isEmpty() { return m_value.isEmpty(); }
 
-  void setReference(const v8::Persistent<v8::Object>& parent,
-                    v8::Isolate* isolate) {
-    m_value.setReference(parent, isolate);
-  }
-
   bool operator==(const SharedPersistent<T>& other) {
     return m_value == other.m_value;
   }
 
  private:
   explicit SharedPersistent(v8::Local<T> value, v8::Isolate* isolate)
       : m_value(isolate, value) {}
   ScopedPersistent<T> m_value;
 };
 
 }  // namespace blink
 
 #endif  // SharedPersistent_h