Use correct property descriptor in generators test

test/mjsunit/es6/generators-runtime.js

Index: test/mjsunit/es6/generators-runtime.js
diff --git a/test/mjsunit/es6/generators-runtime.js b/test/mjsunit/es6/generators-runtime.js
index 6e8ee2ebd3a050e32a601f19f1da40175a4ebd9b..115c7a4149908c9f0fd5725983dd2a23d4b6a286 100644
--- a/test/mjsunit/es6/generators-runtime.js
+++ b/test/mjsunit/es6/generators-runtime.js
@@ -130,10 +130,10 @@ function TestGeneratorObjectPrototype() {
 
   var throw_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       "throw");
-  assertTrue(next_desc !== undefined);
-  assertTrue(next_desc.writable);
-  assertFalse(next_desc.enumerable);
-  assertTrue(next_desc.configurable);
+  assertTrue(throw_desc !== undefined);
+  assertTrue(throw_desc.writable);
+  assertFalse(throw_desc.enumerable);
+  assertTrue(throw_desc.configurable);
 
   var iterator_desc = Object.getOwnPropertyDescriptor(GeneratorObjectPrototype,
       Symbol.iterator);