Align IDL for navigator.cookieEnabled with spec

third_party/WebKit/Source/core/frame/NavigatorCookies.idl

Index: third_party/WebKit/Source/core/frame/NavigatorCookies.idl
diff --git a/third_party/WebKit/Source/core/frame/NavigatorCookies.idl b/third_party/WebKit/Source/core/frame/NavigatorCookies.idl
new file mode 100644
index 0000000000000000000000000000000000000000..c77322a1428f9d58f7f7513a37fd06d2b6096e36
--- /dev/null
+++ b/third_party/WebKit/Source/core/frame/NavigatorCookies.idl
@@ -0,0 +1,10 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://html.spec.whatwg.org/multipage/webappapis.html#cookies
+
+[NoInterfaceObject]
+interface NavigatorCookies {
+  readonly attribute boolean cookieEnabled;
+};