Remove URLs from chrome.tabs.executeScript permission warning.

chrome/test/data/extensions/api_test/active_tab/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.
 
 var assertEq = chrome.test.assertEq;
 var assertFalse = chrome.test.assertFalse;
 var assertTrue = chrome.test.assertTrue;
 var callbackFail = chrome.test.callbackFail;
 var callbackPass = chrome.test.callbackPass;
 
@@ skipping 38 matching lines @@
   assertTrue(canXhr(tab.url));
 
   chrome.automation.getTree(callbackPass(function(rootNode) {
     assertFalse(rootNode == undefined);
     assertEq(RoleType.rootWebArea, rootNode.role);
   }));
 });
 
 chrome.webNavigation.onCompleted.addListener(function(details) {
   chrome.tabs.executeScript({ code: 'true' }, callbackFail(
-         'Cannot access contents of url "' + details.url +
-         '". Extension manifest must request permission to access this host.'));
+         'Cannot access contents of the page. ' +
+         'Extension manifest must request permission to access the ' +
+         'respective host.'));
 
   chrome.automation.getTree(callbackFail(
       'Cannot request automation tree on url "' + details.url +
         '". Extension manifest must request permission to access this host.'));
 
   assertFalse(canXhr(details.url));
 });