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

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

Index: chrome/browser/resources/chromeos/login/oobe_screen_user_image.js
diff --git a/chrome/browser/resources/chromeos/login/oobe_screen_user_image.js b/chrome/browser/resources/chromeos/login/oobe_screen_user_image.js
index 0628c6a7bbdf1ee5a44524c1a2efc476d82c7fce..a7d433fb426e8816dde1479c1a990265196cb7e6 100644
--- a/chrome/browser/resources/chromeos/login/oobe_screen_user_image.js
+++ b/chrome/browser/resources/chromeos/login/oobe_screen_user_image.js
@@ -76,11 +76,11 @@ login.createScreen('UserImageScreen', 'user-image', function() {
       $('flip-photo').addEventListener(
           'click', this.handleFlipPhoto_.bind(this));
       $('user-image-stream-crop').addEventListener(
-          'webkitTransitionEnd', function(e) {
+          'transitionend', function(e) {
             previewElement.classList.remove('animation');
           });
       $('user-image-preview-img').addEventListener(
-          'webkitTransitionEnd', function(e) {
+          'transitionend', function(e) {
             previewElement.classList.remove('animation');
           });