Fix ExtensionManagementApiBrowserTest.LaunchApp to no longer be order-dependent.

chrome/test/data/extensions/management/launch_app/test.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.
 
 window.onload = function() {
   chrome.management.getAll(function(items) {
     for (var i in items) {
       var item = items[i];
       if (item.name == "packaged_app") {
         chrome.management.launchApp(item.id);
-        break;
       }
       if (item.name == "simple_extension") {
         // Try launching a non-app extension, which should fail.
         var expected_error = "Extension " + item.id + " is not an App";
         chrome.management.launchApp(item.id, function() {
           if (chrome.extension.lastError &&
               chrome.extension.lastError.message == expected_error) {
             chrome.test.sendMessage("got_expected_error");
           }
         });
       }
     }
   });
 };