Remove -webkit-*-before/after in:

chrome/browser/resources/chromeos/login/oobe_screen_oauth_enrollment.css

 /* Copyright 2013 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.
  */
 
 #oauth-enrollment {
   min-height: 609px;
   padding: 70px 17px 21px;
   width: 722px;
 }
 
 #oauth-enroll-step-contents {
-  -webkit-margin-after: 10px;
   color: #666;
   display: -webkit-box;
+  margin-bottom: 10px;
 }
 
 #oauth-enroll-step-contents > div {
   display: none;
 }
 
 .oauth-enroll-state-working #oauth-enroll-step-working,
 .oauth-enroll-state-error #oauth-enroll-step-error,
 .oauth-enroll-state-explain #oauth-enroll-step-explain,
 .oauth-enroll-state-success #oauth-enroll-step-success {
@@ skipping 21 matching lines @@
 
 #oauth-enroll-signin-divider {
   -webkit-flex: 0 0 auto;
   background: linear-gradient(to bottom, #e3e3e3, #cacaca 50%, #e3e3e3);
   border: none;
   width: 1px;
 }
 
 #oauth-enroll-signin-right {
   -webkit-flex: 0 0 auto;
-  -webkit-margin-before: 30px;
   -webkit-margin-end: 20px;
   -webkit-margin-start: 30px;
   font-size: 12px;
+  margin-top: 30px;
   width: 200px;
 }
 
 @media (pointer:coarse) {
   #oauth-enroll-signin-right {
     font-size: 14px;
   }
 }
 
 #oauth-enroll-signin-right > div {
-  -webkit-margin-before: 20px;
+  margin-top: 20px;
 }
 
 #oauth-enroll-learn-more-link,
 .oauth-enroll-explain-link {
   display: none;
 }
 
 #oauth-enrollment.mode-manual #oauth-enroll-learn-more-link,
 #oauth-enrollment.mode-forced #oauth-enroll-learn-more-link,
 #oauth-enrollment.mode-recovery #oauth-enroll-learn-more-link {
@@ skipping 90 matching lines @@
   -webkit-padding-end: 17px;
 }
 
 #oauth-enrollment:not(.saml) #oauth-saml-notice-container {
   display: none;
 }
 
 #oauth-saml-notice-message {
   margin: 0 auto;
 }