Polymer upgraded to 1.0 in login flow.

chrome/browser/resources/chromeos/login/gaia_button.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.
  */
 
 :host {
-  background-color: rgb(66, 133, 244);
+  display: inline-block;
+}
+
+paper-button {
+  background-color: var(--google-blue-500);
   color: white;
   font-size: 14px;
   min-width: 90px;
 }
 
-:host([type='link']),
-:host([type='dialog']) {
+:host([type='link']) paper-button,
+:host([type='dialog']) paper-button {
   background-color: transparent;
-  color: rgb(66, 133, 244);
+  color: var(--google-blue-500);
   margin: 0;
   min-width: 0;
 }
 
-:host([type='link']:focus),
-:host([type='dialog']:focus) {
+:host([type='link']) paper-button[focused],
+:host([type='dialog']) paper-button[focused] {
   background-color: rgba(66, 133, 244, 0.12);
 }
 
-:host([type='link']) {
+:host([type='link']) paper-button[disabled],
+:host([type='dialog']) paper-button[disabled] {
+  color: rgb(168,168,168);
+}
+
+:host([type='link']) paper-button {
   border-radius: 0;
   margin-left: -0.57em;
   margin-right: -0.57em;
   text-transform: none;
 }
-
-