Bug 907973 - Suppress an exact rooting non-hazard in ShellObjectMetadataCallback; r=bhackett

--HG--
extra : rebase_source : 3c2911f67d14375bc98580fc483cf61498ed8be3

js/src/builtin/TestingFunctions.cpp

@@ -933,14 +933,12 @@ static const char *ObjectMetadataPropertyName = "__objectMetadataFunction__";
 static bool
 ShellObjectMetadataCallback(JSContext *cx, JSObject **pmetadata)
 {
-    Value thisv = UndefinedValue();
-
     RootedValue fun(cx);
     if (!JS_GetProperty(cx, cx->global(), ObjectMetadataPropertyName, &fun))
         return false;
 
     RootedValue rval(cx);
-    if (!Invoke(cx, thisv, fun, 0, NULL, &rval))
+    if (!Invoke(cx, UndefinedValue(), fun, 0, NULL, &rval))
         return false;
 
     if (rval.isObject())