Return null when no promise/reason is given in PromiseRejectionEvent

Source/core/events/PromiseRejectionEvent.cpp

Index: Source/core/events/PromiseRejectionEvent.cpp
diff --git a/Source/core/events/PromiseRejectionEvent.cpp b/Source/core/events/PromiseRejectionEvent.cpp
index 2a4eb14da3e3e3f7db1e1889e116c6543a59e2ba..6351986ce8cbc1144df988d415b6d1230a48137a 100644
--- a/Source/core/events/PromiseRejectionEvent.cpp
+++ b/Source/core/events/PromiseRejectionEvent.cpp
@@ -29,16 +29,14 @@ PromiseRejectionEvent::~PromiseRejectionEvent()
 {
 }
 
-ScriptPromise PromiseRejectionEvent::promise(ScriptState* state) const
+v8::Local<v8::Value> PromiseRejectionEvent::promise(v8::Isolate* isolate) const
 {
-    v8::Local<v8::Value> value = m_promise.newLocal(state->isolate());
-    return ScriptPromise(state, value);
+    return m_promise.newLocal(isolate);
 }
 
-ScriptValue PromiseRejectionEvent::reason(ScriptState* state) const
+v8::Local<v8::Value> PromiseRejectionEvent::reason(v8::Isolate* isolate) const
 {
-    v8::Local<v8::Value> value = m_reason.newLocal(state->isolate());
-    return ScriptValue(state, value);
+    return m_reason.newLocal(isolate);
 }
 
 const AtomicString& PromiseRejectionEvent::interfaceName() const