Unified icon-buttons used in the new GAIA flow.

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

 /* Copyright 2015 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 {
   height: 528px;
   padding: 0;
   width: 448px;
 }
@@ skipping 104 matching lines @@
 #oauth-enrollment:not(.saml) #oauth-saml-notice-container {
   display: none;
 }
 
 #oauth-saml-notice-message {
   color: rgb(106, 106, 106);
   font-size: 13px;
   margin: 0 auto;
 }
 
+#oauth-enroll-cancel-button,
+#oauth-enroll-back-button {
+  position: absolute;
+  top: 10px;
+}
+
 #oauth-enroll-cancel-button {
-  background-image: url(chrome://theme/IDR_LOGIN_CLOSE_BUTTTON_ON_WHITE);
+  color: rgba(0, 0, 0, .54);
   right: 10px;
 }
 
 html[dir=rtl] #oauth-enroll-cancel-button {
   left: 10px;
   right: auto;
 }
 
+#oauth-enrollment.saml #oauth-enroll-cancel-button {
+  color: rgba(0, 0, 0, .54);
+}
+
 .oauth-enroll-state-signin #oauth-enroll-cancel-button,
 .oauth-enroll-state-working #oauth-enroll-cancel-button {
-  background-image: url(chrome://theme/IDR_LOGIN_CLOSE_BUTTTON);
+  color: white;
 }
 
 #oauth-enroll-back-button {
-  background-image: url(chrome://theme/IDR_LOGIN_BACK_BUTTTON);
+  color: white;
   left: 10px;
 }
 
 html[dir=rtl] #oauth-enroll-back-button {
   -webkit-transform: scaleX(-1);
   left: auto;
   right: 10px;
 }
 
 #oauth-enrollment.saml #oauth-enroll-back-button {
   display: none;
 }
 
 #oauth-enroll-attribute-prompt-message {
   color: black;
 }