Fix chromedriver test extensions to use manifest version 2 and not inline

chrome/test/webdriver/test/infobar_browser_action_extension/bg.js

Index: chrome/test/webdriver/test/infobar_browser_action_extension/bg.js
diff --git a/chrome/test/webdriver/test/infobar_browser_action_extension/bg.js b/chrome/test/webdriver/test/infobar_browser_action_extension/bg.js
new file mode 100644
index 0000000000000000000000000000000000000000..9a2fa6202878f8726179086a4bfd02e7d3bcf819
--- /dev/null
+++ b/chrome/test/webdriver/test/infobar_browser_action_extension/bg.js
@@ -0,0 +1,20 @@
+// 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 g_infobarReady = false;
+var g_callback = null;
+function waitForInfobar(callback) {
+  if (g_infobarReady)
+    callback();
+  g_callback = callback;
+}
+
+chrome.tabs.getSelected(null, function(tab) {
+  chrome.experimental.infobars.show(
+      {'tabId': tab.id, 'path': 'view_checks.html'}, function() {
+    g_infobarReady = true;
+    if (g_callback)
+      g_callback();
+  });
+});