IDL: For DOMString? attribute getters, use null string to represent null

Source/bindings/tests/results/V8TestObject.cpp

Index: Source/bindings/tests/results/V8TestObject.cpp
diff --git a/Source/bindings/tests/results/V8TestObject.cpp b/Source/bindings/tests/results/V8TestObject.cpp
index fddb3f1b8623bf5771ea0c2af88a9435dc10c942..2baf6d646b3635be31434abfc21a8d577df3351c 100644
--- a/Source/bindings/tests/results/V8TestObject.cpp
+++ b/Source/bindings/tests/results/V8TestObject.cpp
@@ -1520,9 +1520,8 @@ static void stringOrNullAttributeAttributeGetter(const v8::PropertyCallbackInfo<
 {
     v8::Handle<v8::Object> holder = info.Holder();
     TestObject* impl = V8TestObject::toNative(holder);
-    bool isNull = false;
-    String cppValue(impl->stringOrNullAttribute(isNull));
-    if (isNull) {
+    String cppValue(impl->stringOrNullAttribute());

[Jens Widell, 2014/06/30 10:43:41]

For reference, this change is identical to the change in CG for
NavigatorLanguage.language and MouseEventHitRegion.region. (And that's the only
way CG changes.)

+    if (!cppValue) {
         v8SetReturnValueNull(info);
         return;
     }