IDL: Use Nullable for union type return value

Source/bindings/tests/results/V8TestTypedefs.cpp

Index: Source/bindings/tests/results/V8TestTypedefs.cpp
diff --git a/Source/bindings/tests/results/V8TestTypedefs.cpp b/Source/bindings/tests/results/V8TestTypedefs.cpp
index 0ef385bf2d8ae7232f052fb04ec705077fbcff3b..d4c45e6caf36fba9efecf63a0908e351538fe6b2 100644
--- a/Source/bindings/tests/results/V8TestTypedefs.cpp
+++ b/Source/bindings/tests/results/V8TestTypedefs.cpp
@@ -196,17 +196,15 @@ static void uLongLongMethodTestInterfaceEmptyTypeSequenceArgMethodCallback(const
 static void testInterfaceOrTestInterfaceEmptyMethodMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     TestTypedefs* impl = V8TestTypedefs::toNative(info.Holder());
-    bool result0Enabled = false;
-    RefPtr<TestInterfaceImplementation> result0;
-    bool result1Enabled = false;
-    RefPtr<TestInterfaceEmpty> result1;
-    impl->testInterfaceOrTestInterfaceEmptyMethod(result0Enabled, result0, result1Enabled, result1);
-    if (result0Enabled) {
-        v8SetReturnValue(info, result0.release());
+    Nullable<RefPtr<TestInterfaceImplementation> > result0;
+    Nullable<RefPtr<TestInterfaceEmpty> > result1;
+    impl->testInterfaceOrTestInterfaceEmptyMethod(result0, result1);
+    if (!result0.isNull()) {
+        v8SetReturnValue(info, result0.get().release());
         return;
     }
-    if (result1Enabled) {
-        v8SetReturnValue(info, result1.release());
+    if (!result1.isNull()) {
+        v8SetReturnValue(info, result1.get().release());
         return;
     }
     v8SetReturnValueNull(info);