Change var blah_blah -> blahBlah.

chrome/browser/resources/chromeos/login/oobe_screen_update.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview Oobe update screen implementation.
  */
 
 cr.define('oobe', function() {
   /**
@@ skipping 52 matching lines @@
     cancel: function() {
       // It's safe to act on the accelerator even if it's disabled on official
       // builds, since Chrome will just ignore the message in that case.
       var updateCancelHint = $('update-cancel-hint').firstElementChild;
       updateCancelHint.textContent =
           loadTimeData.getString('cancelledUpdateMessage');
       chrome.send('cancelUpdate');
     },
   };
 
-  var ellipsis_animation_active = false;
+  var ellipsisAnimationActive = false;
 
   /**
    * Updates number of dots in the ellipsis.
    *
    * @private
    * @param {number} count Number of dots that should be shown.
    */
   function updateEllipsisAnimation_(count) {
     $('update-checking-ellipsis').textContent = ELLIPSIS[count];
-    if (ellipsis_animation_active) {
+    if (ellipsisAnimationActive) {
       window.setTimeout(function() {
           updateEllipsisAnimation_((count + 1) % ELLIPSIS.length);
         }, ELLIPSIS_ANIMATION_TIMEOUT_MS);
     }
   };
 
   /**
    * Makes 'press Escape to cancel update' hint visible.
    */
   UpdateScreen.enableUpdateCancel = function() {
     $('update-cancel-hint').hidden = false;
   };
 
   /**
    * Starts animation for tail ellipses in "Checking for update..." label.
    */
   UpdateScreen.startEllipsisAnimation = function() {
-    ellipsis_animation_active = true;
+    ellipsisAnimationActive = true;
     updateEllipsisAnimation_(0);
   };
 
   /**
    * Stops animation for tail ellipses in "Checking for update..." label.
    */
   UpdateScreen.stopEllipsisAnimation = function() {
-    ellipsis_animation_active = false;
+    ellipsisAnimationActive = false;
   };
 
   return {
     UpdateScreen: UpdateScreen
   };
 });