Refactor and fix declarative webRequest API permissions

chrome/test/data/extensions/api_test/webrequest_permissions/spanning/background.js

+// Copyright (c) 2012 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.
+
+chrome.declarativeWebRequest.onRequest.removeRules();
+var rule = {
+  conditions: [
+    new chrome.declarativeWebRequest.RequestMatcher(
+        {url: {pathContains: '.html'}}),
+  ],
+  actions: [
+    new chrome.declarativeWebRequest.RedirectRequest(
+        {'redirectUrl': 'data:text/plain,redirected1'})
+  ],
+}
+function notifyDone() {
+  chrome.test.sendMessage("done");
+}
+chrome.declarativeWebRequest.onRequest.addRules([rule], notifyDone);