ChromeOS: Update styles of material design OOBE.

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

 // Copyright 2016 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.
 
 Polymer({
-  is: 'oobe-next-button',
-
-  properties: {
-    disabled: {
-      type: Boolean,
-      value: false,
-    }
-  },
-
-  onClick_: function(e) {
-    if (this.disabled)
-      e.stopPropagation();
-  }
-});
-
-Polymer({
   is: 'oobe-icon-button',
 
   properties: {
     disabled: {type: Boolean, value: false, reflectToAttribute: true},
 
     icon: String,
 
     ariaLabel: String
   },
 
@@ skipping 20 matching lines @@
 
   focus: function() {
     this.$.textButton.focus();
   },
 
   onClick_: function(e) {
     if (this.disabled)
       e.stopPropagation();
   }
 });