Change var blah_blah -> blahBlah.

chrome/browser/resources/chromeos/login/oobe.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 Out of the box experience flow (OOBE).
  * This is the main code for the OOBE WebUI implementation.
  */
 
 <include src="../user_images_grid.js"></include>
@@ skipping 46 matching lines @@
    */
   Oobe.setupSelect = function(select, list, callback) {
     select.options.length = 0;
     for (var i = 0; i < list.length; ++i) {
       var item = list[i];
       var option =
           new Option(item.title, item.value, item.selected, item.selected);
       select.appendChild(option);
     }
     if (callback) {
-      var send_callback = function() {
+      var sendCallback = function() {
         chrome.send(callback, [select.options[select.selectedIndex].value]);
       };
-      select.addEventListener('blur', function(event) { send_callback(); });
-      select.addEventListener('click', function(event) { send_callback(); });
+      select.addEventListener('blur', sendCallback);
+      select.addEventListener('click', sendCallback);
       select.addEventListener('keyup', function(event) {
-        var keycode_interested = [
+        var keycodeInterested = [
           9,  // Tab
           13,  // Enter
           27,  // Escape
         ];
-        if (keycode_interested.indexOf(event.keyCode) >= 0)
-          send_callback();
+        if (keycodeInterested.indexOf(event.keyCode) >= 0)
+          sendCallback();
       });
     }
   };
 
   /**
    * Initializes the OOBE flow.  This will cause all C++ handlers to
    * be invoked to do final setup.
    */
   Oobe.initialize = function() {
     DisplayManager.initialize();
@@ skipping 459 matching lines @@
 // Allow selection events on components with editable text (password field)
 // bug (http://code.google.com/p/chromium/issues/detail?id=125863)
 disableTextSelectAndDrag(function(e) {
   var src = e.target;
   return src instanceof HTMLTextAreaElement ||
          src instanceof HTMLInputElement &&
          /text|password|search/.test(src.type);
 });
 
 document.addEventListener('DOMContentLoaded', cr.ui.Oobe.initialize);