Correctly track lifetime of promise rejection events

Source/core/events/PromiseRejectionEvent.h

Index: Source/core/events/PromiseRejectionEvent.h
diff --git a/Source/core/events/PromiseRejectionEvent.h b/Source/core/events/PromiseRejectionEvent.h
index c71f5dbe04b5598b4aa51faad2fd551469712fb3..2f9c68c431ad2c1c80fc47680877e67ff1cea609 100644
--- a/Source/core/events/PromiseRejectionEvent.h
+++ b/Source/core/events/PromiseRejectionEvent.h
@@ -5,6 +5,7 @@
 #ifndef PromiseRejectionEvent_h
 #define PromiseRejectionEvent_h
 
+#include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptState.h"
@@ -30,6 +31,8 @@ public:
     ScriptValue reason(ScriptState*) const;
     ScriptPromise promise(ScriptState*) const;
 
+    void setWrapperReference(v8::Isolate*, const v8::Persistent<v8::Object>&);
+
     virtual const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();