Prevent unnecessary prompts when unpacked extensions use chrome.permissions.request.

chrome/test/data/extensions/api_test/permissions/optional/background.js

 // Copyright (c) 2011 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 fail = chrome.test.callbackFail;
 var pass = chrome.test.callbackPass;
 var listenOnce = chrome.test.listenOnce;
@@ skipping 137 matching lines @@
             assertTrue(granted);
             chrome.windows.getAll({populate: true}, pass(function(windows) {
               assertTrue(true);
             }));
             chrome.permissions.getAll(pass(function(permissions) {
               assertTrue(checkPermSetsEq(permissionsWithTabs, permissions));
             }));
       }));
     },
 
+    // These permissions should be on the granted list because they're on the
+    // extension's default permission list.
+    function requestGrantedPermission() {
+      chrome.permissions.request(
+          {permissions: ['management'], origins: ['http://a.com/*']},
+          pass(function(granted) {
+        assertTrue(granted);
+      }));
+    },
+
     // You can't remove required permissions.
     function removeRequired() {
       chrome.permissions.remove(
           {permissions: ['management']}, fail(REQUIRED_ERROR));
       chrome.permissions.remove(
           {origins: ['http://a.com/*']}, fail(REQUIRED_ERROR));
       chrome.permissions.remove(
           {permissions: ['tabs'], origins: ['http://a.com/*']},
           fail(REQUIRED_ERROR));
     },
@@ skipping 129 matching lines @@
         try {
           chrome.windows.getAll({populate: true}, function() {
             chrome.test.fail("Should not have tabs API permission.");
           });
         } catch (e) {
           assertTrue(e.message.indexOf(NO_TABS_PERMISSION) == 0);
         }
       });
 
       chrome.permissions.request(
-          {permissions: ['tabs']}, pass(function(granted) {
+          {permissions: ['tabs', 'management']}, pass(function(granted) {
         assertTrue(granted);
         chrome.permissions.remove(
             {permissions: ['tabs']}, pass(function() {
           assertTrue(true);
         }));
       }));
     }
 
   ]);
 });