Change the title of the desktop User Manager widget.

chrome/browser/resources/user_manager/user_manager_tutorial.js

Index: chrome/browser/resources/user_manager/user_manager_tutorial.js
diff --git a/chrome/browser/resources/user_manager/user_manager_tutorial.js b/chrome/browser/resources/user_manager/user_manager_tutorial.js
index f5096b63286086772191320fe457a2d1c0d9ae67..41ae9d100edeaed23cc850e6705e7aad02281fbc 100644
--- a/chrome/browser/resources/user_manager/user_manager_tutorial.js
+++ b/chrome/browser/resources/user_manager/user_manager_tutorial.js
@@ -72,9 +72,15 @@ cr.define('cr.ui.login', function() {
     handleAddUserClick_: function(e) {
       chrome.send('addUser');
       $('user-manager-tutorial').hidden = true;
-      // Prevent further propagation of click event. Otherwise, the click event
-      // handler of document object will set wallpaper to user's wallpaper when
-      // there is only one existing user. See http://crbug.com/166477
+      e.stopPropagation();
+    },
+
+    /**
+     * Add a button click handler to dismiss the last tutorial bubble.
+     * @private
+     */
+    handleDismissBubbleClick_: function(e) {
+      $('user-manager-tutorial').hidden = true;
       e.stopPropagation();
     },
 
@@ -94,6 +100,8 @@ cr.define('cr.ui.login', function() {
       }
       $('slide-add-user').addEventListener('click',
           this.handleAddUserClick_.bind(this));
+      $('dismiss-bubble-button').addEventListener('click',
+          this.handleDismissBubbleClick_.bind(this));
     }
   };