IDL: Use Nullable for union type return value

Source/core/html/HTMLOptionsCollection.cpp

Index: Source/core/html/HTMLOptionsCollection.cpp
diff --git a/Source/core/html/HTMLOptionsCollection.cpp b/Source/core/html/HTMLOptionsCollection.cpp
index 95b359943db341031c07819863162163e4e552c7..9f5119593b0c0c7dc5dbf60707c60a44ce3ab41f 100644
--- a/Source/core/html/HTMLOptionsCollection.cpp
+++ b/Source/core/html/HTMLOptionsCollection.cpp
@@ -118,7 +118,7 @@ void HTMLOptionsCollection::setLength(unsigned length, ExceptionState& exception
     toHTMLSelectElement(ownerNode()).setLength(length, exceptionState);
 }
 
-void HTMLOptionsCollection::namedGetter(const AtomicString& name, bool& returnValue0Enabled, RefPtrWillBeRawPtr<NodeList>& returnValue0, bool& returnValue1Enabled, RefPtrWillBeRawPtr<Element>& returnValue1)
+void HTMLOptionsCollection::namedGetter(const AtomicString& name, Nullable<RefPtrWillBeRawPtr<NodeList> >& returnValue0, Nullable<RefPtrWillBeRawPtr<Element> >& returnValue1)
 {
     WillBeHeapVector<RefPtrWillBeMember<Element> > namedItems;
     this->namedItems(name, namedItems);
@@ -127,14 +127,12 @@ void HTMLOptionsCollection::namedGetter(const AtomicString& name, bool& returnVa
         return;
 
     if (namedItems.size() == 1) {
-        returnValue1Enabled = true;
-        returnValue1 = namedItems.at(0);
+        returnValue1.set(namedItems.at(0));
         return;
     }
 
     // FIXME: The spec and Firefox do not return a NodeList. They always return the first matching Element.
-    returnValue0Enabled = true;
-    returnValue0 = StaticElementList::adopt(namedItems);
+    returnValue0.set(StaticElementList::adopt(namedItems));
 }
 
 bool HTMLOptionsCollection::anonymousIndexedSetter(unsigned index, PassRefPtrWillBeRawPtr<HTMLOptionElement> value, ExceptionState& exceptionState)