Align IDL for navigator.cookieEnabled with spec

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

Index: third_party/WebKit/Source/core/frame/NavigatorStorageUtils.idl
diff --git a/third_party/WebKit/Source/core/frame/NavigatorStorageUtils.idl b/third_party/WebKit/Source/core/frame/NavigatorStorageUtils.idl
deleted file mode 100644
index b408dc7d77ab024bec18fcfb2b625d52f94355db..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/frame/NavigatorStorageUtils.idl
+++ /dev/null
@@ -1,11 +0,0 @@
-// 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/#manually-releasing-the-storage-mutex
-
-[
-    NoInterfaceObject, // Always used on target of 'implements'
-] interface NavigatorStorageUtils {
-    readonly attribute boolean cookieEnabled;
-};