Update references to the extension messaging APIs to point to the "runtime"

chrome/test/data/extensions/api_test/webrequest/permissionless/rules.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.
 
 // See ../test_declarative_permissions.js for the tests that use these rules.
 
 var onRequest = chrome.declarativeWebRequest.onRequest;
 var RequestMatcher = chrome.declarativeWebRequest.RequestMatcher;
 
 chrome.test.getConfig(function(config) {
@@ skipping 24 matching lines @@
       })]
      },
 
      {conditions: [new RequestMatcher({url: {pathContains: 'blank'}})],
       actions: [new chrome.declarativeWebRequest.RedirectToEmptyDocument()]
      },
      {conditions: [new RequestMatcher({url: {pathContains: 'cancel'}})],
       actions: [new chrome.declarativeWebRequest.CancelRequest()]
      }],
     function(rules) {
-      if (chrome.extension.lastError)
-        chrome.test.fail(chrome.extension.lastError);
+      if (chrome.runtime.lastError)
+        chrome.test.fail(chrome.runtime.lastError);
       chrome.test.sendMessage("rules all registered");
     }
   );
 }