Convert snakecase enum names to camelcase when stringified.

chrome/test/data/extensions/api_test/automation/tests/desktop/desktop.js

 // Copyright 2014 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 allTests = [
   function testGetDesktop() {
     chrome.automation.getDesktop(function(tree) {
-      tree.addEventListener('load_complete', function(e) {
+      tree.addEventListener('loadComplete', function(e) {
         assertEq('desktop', tree.root.role);
         assertEq('window', tree.root.firstChild().role);
         chrome.test.succeed();
       }, true);
     });
   }
 ];
 
 chrome.test.runTests(allTests);