Update Chromium Buildbot Monitor extension.

It is using a now defunct webkit notifications API and thus with recent
versions of Chrome a notification balloon that used to appear in the
right bottom does not appear anymore.

This patches makes the changes necessary so the notification balloon
appears again.

BUG=None
TEST=None
R=peter@chromium.org,miket@chromium.org

Review URL: https://codereview.chromium.org/420103003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@286141 0039d316-1c4b-4281-b951-d872f2087c98

chrome/common/extensions/docs/examples/extensions/buildbot/bg.js

@@ -25,12 +25,12 @@ function updateBadgeOnErrorStatus() {
 var lastNotification = null;
 function notifyStatusChange(treeState, status) {
   if (lastNotification)
-    lastNotification.cancel();
+    lastNotification.close();
 
-  var notification = webkitNotifications.createNotification(
-    chrome.extension.getURL("icon.png"), "Tree is " + treeState, status);
-  lastNotification = notification;
-  notification.show();
+  lastNotification = new Notification("Tree is " + treeState, {
+    icon: chrome.extension.getURL("icon.png"),
+    body: status
+  });
 }
 
 // The type parameter should be "open", "closed", or "throttled".