Fixed chromedriver_tests.ExtensionTest.testAppShellView failure due to changes from chrome apps.

chrome/test/webdriver/test/app_shell_extension/bg.js

Index: chrome/test/webdriver/test/app_shell_extension/bg.js
diff --git a/chrome/test/webdriver/test/app_shell_extension/bg.js b/chrome/test/webdriver/test/app_shell_extension/bg.js
index aaeae4447fa4759b3ced774e444d99bf5190e6e1..4fdf0e2fec00e4d068017b26efa3061465e6641c 100644
--- a/chrome/test/webdriver/test/app_shell_extension/bg.js
+++ b/chrome/test/webdriver/test/app_shell_extension/bg.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-chrome.experimental.app.onLaunched.addListener(function(data) {
+chrome.app.runtime.onLaunched.addListener(function(data) {
   chrome.app.window.create('view_checks.html', {
     frame: 'chrome',
     width: 1024,