Correctly track lifetime of promise rejection events

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 @@
         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