Move Declarative Web Request API out of experimental and make it a feature

chrome/test/data/extensions/api_test/webrequest/test_declarative.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.
 
-var onRequest = chrome.experimental.webRequest.onRequest;
-var RequestMatcher = chrome.experimental.webRequest.RequestMatcher;
-var CancelRequest = chrome.experimental.webRequest.CancelRequest;
-var RedirectRequest = chrome.experimental.webRequest.RedirectRequest;
+var onRequest = chrome.declarativeWebRequest.onRequest;
+var RequestMatcher = chrome.declarativeWebRequest.RequestMatcher;
+var CancelRequest = chrome.declarativeWebRequest.CancelRequest;
+var RedirectRequest = chrome.declarativeWebRequest.RedirectRequest;
 
 function getURLHttpSimple() {
   return getServerURL("files/extensions/api_test/webrequest/simpleLoad/a.html");
 }
 
 function getURLHttpComplex() {
   return getServerURL(
       "files/extensions/api_test/webrequest/complexLoad/a.html");
 }
 
@@ skipping 73 matching lines @@
 
     onRequest.addRules(
       [ {'conditions': [new RequestMatcher({'url': {'pathSuffix': ".html"}})],
          'actions': [
              new RedirectRequest({'redirectUrl': getURLHttpSimple()})]}
       ],
       function() {navigateAndWait(getURLHttpComplex());}
     );
   },
   ]);