diff -r 000000000000 -r 6474c204b198 dom/base/WindowNamedPropertiesHandler.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/base/WindowNamedPropertiesHandler.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 sw=2 et tw=78: */
+/* 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/. */
+
+#ifndef mozilla_dom_WindowNamedPropertiesHandler_h
+#define mozilla_dom_WindowNamedPropertiesHandler_h
+
+#include "mozilla/dom/DOMJSProxyHandler.h"
+
+namespace mozilla {
+namespace dom {
+
+class WindowNamedPropertiesHandler : public BaseDOMProxyHandler
+{
+public:
+  WindowNamedPropertiesHandler() : BaseDOMProxyHandler(nullptr)
+  {
+    setHasPrototype(true);
+  }
+  virtual bool
+  preventExtensions(JSContext* aCx, JS::Handle<JSObject*> aProxy) MOZ_OVERRIDE
+  {
+    // Throw a TypeError, per WebIDL.
+    JS_ReportErrorNumber(aCx, js_GetErrorMessage, nullptr,
+                         JSMSG_CANT_CHANGE_EXTENSIBILITY);
+    return false;
+  }
+  virtual bool
+  getOwnPropDescriptor(JSContext* aCx, JS::Handle<JSObject*> aProxy,
+                       JS::Handle<jsid> aId,
+                       bool /* unused */,
+                       JS::MutableHandle<JSPropertyDescriptor> aDesc) MOZ_OVERRIDE;
+  virtual bool
+  defineProperty(JSContext* aCx, JS::Handle<JSObject*> aProxy,
+                 JS::Handle<jsid> aId,
+                 JS::MutableHandle<JSPropertyDescriptor> aDesc) MOZ_OVERRIDE;
+  virtual bool
+  ownPropNames(JSContext* aCx, JS::Handle<JSObject*> aProxy, unsigned flags,
+               JS::AutoIdVector& aProps) MOZ_OVERRIDE;
+  virtual bool
+  delete_(JSContext* aCx, JS::Handle<JSObject*> aProxy, JS::Handle<jsid> aId,
+          bool* aBp) MOZ_OVERRIDE;
+  virtual bool
+  isExtensible(JSContext* aCx, JS::Handle<JSObject*> aProxy,
+               bool* aIsExtensible) MOZ_OVERRIDE
+  {
+    *aIsExtensible = true;
+    return true;
+  }
+  virtual const char*
+  className(JSContext *aCx, JS::Handle<JSObject*> aProxy) MOZ_OVERRIDE
+  {
+    return "WindowProperties";
+  }
+
+  static WindowNamedPropertiesHandler*
+  getInstance()
+  {
+    static WindowNamedPropertiesHandler instance;
+    return &instance;
+  }
+
+  // For Install, aProto is the proto of the Window we're associated with.
+  static void
+  Install(JSContext *aCx, JS::Handle<JSObject*> aProto);
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_WindowNamedPropertiesHandler_h */