Unified icon-buttons used in the new GAIA flow.

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

 // 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.
 
 login.createScreen('OAuthEnrollmentScreen', 'oauth-enrollment', function() {
   /** @const */ var STEP_SIGNIN = 'signin';
   /** @const */ var STEP_WORKING = 'working';
   /** @const */ var STEP_ATTRIBUTE_PROMPT = 'attribute-prompt';
   /** @const */ var STEP_ERROR = 'error';
   /** @const */ var STEP_SUCCESS = 'success';
@@ skipping 100 matching lines @@
                                                     this.doRetry_.bind(this));
       function doneCallback() {
         chrome.send('oauthEnrollClose', ['done']);
       };
 
       $('oauth-enroll-attribute-prompt-error-card').addEventListener(
           'buttonclick', doneCallback);
       $('oauth-enroll-success-card').addEventListener(
           'buttonclick', doneCallback);
 
-      $('oauth-enroll-cancel-button').addEventListener('mousedown',
-                                                       function(e) {
-        e.preventDefault();
-      });
-
       $('oauth-enroll-cancel-button').addEventListener('click',
                                                        this.cancel.bind(this));
 
-      $('oauth-enroll-back-button').addEventListener('mousedown', function(e) {
-        e.preventDefault();
-      });
-
       $('oauth-enroll-back-button').addEventListener('click',
           (function(e) {
             $('oauth-enroll-back-button').hidden = true;
             $('oauth-enroll-auth-view').back();
             e.preventDefault();
           }).bind(this));
 
       $('oauth-enroll-attribute-prompt-card').addEventListener('submit',
           this.onAttributesSubmitted.bind(this));
 
@@ skipping 148 matching lines @@
      * Uploads the device attributes to server. This goes to C++ side through
      * |chrome| and launches the device attribute update negotiation.
      */
     onAttributesSubmitted: function() {
       chrome.send('oauthEnrollAttributes',
                   [$('oauth-enroll-asset-id').value,
                    $('oauth-enroll-location').value]);
     }
   };
 });