Refactor and fix declarative webRequest API permissions

chrome/test/data/extensions/api_test/webrequest_permissions/split/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: [],
+}
+if (chrome.extension.inIncognitoContext) {
+  rule.actions = [
+    new chrome.declarativeWebRequest.RedirectRequest(
+        {'redirectUrl': 'data:text/plain,redirected2'})
+  ];
+} else {
+  rule.actions = [
+    new chrome.declarativeWebRequest.RedirectRequest(
+        {'redirectUrl': 'data:text/plain,redirected1'})
+  ];
+}
+function notifyDone() {
+  if (chrome.extension.inIncognitoContext)
+    chrome.test.sendMessage("done_incognito");
+  else
+    chrome.test.sendMessage("done");
+}
+chrome.declarativeWebRequest.onRequest.addRules([rule], notifyDone);