Added compiler lint ban on DOMRefCell

tests/compiletest/plugin/compile-fail/ban-domrefcell.rs

@@ -0,0 +1,19 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#![feature(plugin)]
+#![plugin(plugins)]
+
+extern crate script;
+
+use script::dom::bindings::cell::DOMRefCell;
+use script::dom::bindings::js::JS;
+use script::dom::node::Node;
+
+struct Foo {
+    bar: DOMRefCell<JS<Node>>
+    //~^ ERROR Banned type DOMRefCell<JS<T>> detected. Use MutHeap<JS<T>> instead,
+}
+
+fn main() {}