Merge 65722 - Split the private webstore install API into two parts....

chrome/test/data/extensions/api_test/extension_gallery_install/common.js

 // Copyright (c) 2010 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 extension_id = "ldnnhddmnhbkjipkidpdiheffobcpfmf";
 
 var assertEq = chrome.test.assertEq;
 var assertNoLastError = chrome.test.assertNoLastError;
 var succeed = chrome.test.succeed;
 
 // Calls |callback| with true/false indicating whether an item with an id of
 // extension_id is installed.
 function checkInstalled(callback) {
   chrome.management.getAll(function(extensions) {
     var found = false;
     callback(extensions.some(function(ext) {
       return ext.id == extension_id;
     }));
   });
 }