Issue #2490 - Part 12: Convert CSSStyleRule to WebIDL.

The .style PutForwards bit is coming along for the ride here, aligning us with
the behavior of Blink and Gecko.

layout/style/BindingStyleRule.cpp

@@ -0,0 +1,18 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "mozilla/BindingStyleRule.h"
+#include "mozilla/dom/CSSStyleRuleBinding.h"
+
+namespace mozilla {
+
+/* virtual */ JSObject*
+BindingStyleRule::WrapObject(JSContext* aCx,
+			     JS::Handle<JSObject*> aGivenProto)
+{
+  return dom::CSSStyleRuleBinding::Wrap(aCx, this, aGivenProto);
+}
+
+} // namespace mozilla