Reduce usage of webkit CSS prefixes in chrome/browser/resources

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

Index: chrome/browser/resources/chromeos/login/header_bar.js
diff --git a/chrome/browser/resources/chromeos/login/header_bar.js b/chrome/browser/resources/chromeos/login/header_bar.js
index d5217437f243443c30de92b52f8e92d288a9d895..1db3b2768ae448602949ea0765694901f87a685d 100644
--- a/chrome/browser/resources/chromeos/login/header_bar.js
+++ b/chrome/browser/resources/chromeos/login/header_bar.js
@@ -355,8 +355,8 @@ cr.define('login', function() {
     animateOut: function(callback) {
       var launcher = this;
       launcher.addEventListener(
-          'webkitTransitionEnd', function f(e) {
-            launcher.removeEventListener('webkitTransitionEnd', f);
+          'transitionend', function f(e) {
+            launcher.removeEventListener('transitionend', f);
             callback();
           });
       // Guard timer for 2 seconds + 200 ms + epsilon.
@@ -378,8 +378,8 @@ cr.define('login', function() {
       if (callback) {
         var launcher = this;
         launcher.addEventListener(
-            'webkitTransitionEnd', function f(e) {
-              launcher.removeEventListener('webkitTransitionEnd', f);
+            'transitionend', function f(e) {
+              launcher.removeEventListener('transitionend', f);
               callback();
             });
         // Guard timer for 2 seconds + 200 ms + epsilon.