JSON stringify and parse have the wrong length. bug 554082. r=waldo

js/src/json.cpp

@@ -1222,8 +1222,8 @@ static JSFunctionSpec json_static_methods[] = {
 #if JS_HAS_TOSOURCE
     JS_FN(js_toSource_str,  json_toSource,      0, 0),
 #endif
-    JS_FN("parse",          js_json_parse,      1, 0),
-    JS_FN("stringify",      js_json_stringify,  1, 0),
+    JS_FN("parse",          js_json_parse,      2, 0),
+    JS_FN("stringify",      js_json_stringify,  3, 0),
     JS_FS_END
 };