Correctly track lifetime of promise rejection events

Source/bindings/core/v8/ScriptPromise.h

 /*
  * Copyright (C) 2013 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 80 matching lines @@
     bool isEmpty() const
     {
         return m_promise.isEmpty();
     }
 
     void clear()
     {
         m_promise.clear();
     }
 
+    void setReference(const v8::Persistent<v8::Object>& parent, v8::Isolate* isolate)
+    {
+        m_promise.setReference(parent, isolate);
+    }
+
     bool operator==(const ScriptPromise& value) const
     {
         return m_promise == value.m_promise;
     }
 
     bool operator!=(const ScriptPromise& value) const
     {
         return !operator==(value);
     }
 
@@ skipping 28 matching lines @@
 
 private:
     RefPtr<ScriptState> m_scriptState;
     ScriptValue m_promise;
 };
 
 } // namespace blink
 
 
 #endif // ScriptPromise_h