Submit button incompatiable with desktop chrome.

ui/login/account_picker/user_pod_row.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview User pod row implementation.
  */
 
 cr.define('login', function() {
   /**
@@ skipping 739 matching lines @@
     /**
      * Initializes the pod after its properties set and added to a pod row.
      */
     initialize: function() {
       this.passwordElement.addEventListener('keydown',
           this.parentNode.handleKeyDown.bind(this.parentNode));
       this.passwordElement.addEventListener('keypress',
           this.handlePasswordKeyPress_.bind(this));
       this.passwordElement.addEventListener('input',
           this.handleInputChanged_.bind(this));
-      this.submitButton.addEventListener('click',
-          this.handleSubmitButtonClick_.bind(this));
+      if (this.submitButton) {
+        this.submitButton.addEventListener('click',
+            this.handleSubmitButtonClick_.bind(this));
+      }
 
       this.imageElement.addEventListener('load',
           this.parentNode.handlePodImageLoad.bind(this.parentNode, this));
 
       var initialAuthType = this.user.initialAuthType ||
           AUTH_TYPE.OFFLINE_PASSWORD;
       this.setAuthType(initialAuthType, null);
 
       this.userClickAuthAllowed_ = false;
 
@@ skipping 353 matching lines @@
       } else if (this.user_.isApp) {
         this.setUserPodIconType('app');
       }
     },
 
     isPinReady: function() {
       return this.pinKeyboard && this.pinKeyboard.offsetHeight > 0;
     },
 
     set showError(visible) {
-      this.submitButton.classList.toggle('error-shown', visible);
+      if (this.submitButton)
+        this.submitButton.classList.toggle('error-shown', visible);
     },
 
     toggleTransitions: function(enable) {
       this.classList.toggle('flying-pin-pod', enable);
     },
 
     updatePinClass_: function(element, enable) {
       element.classList.toggle('pin-enabled', enable);
       element.classList.toggle('pin-disabled', !enable);
     },
@@ skipping 709 matching lines @@
         this.parentNode.setActivatedPod(this);
     },
 
     handlePinChanged_: function(e) {
       this.passwordElement.value = e.detail.pin;
     },
 
     handleInputChanged_: function(e) {
       if (this.pinKeyboard)
         this.pinKeyboard.value = this.passwordElement.value;
-      this.submitButton.disabled = this.passwordElement.value.length <= 0;
+      if (this.submitButton)
+        this.submitButton.disabled = this.passwordElement.value.length <= 0;
       this.showError = false;
     },
 
     /**
      * Handles click event on a user pod.
      * @param {Event} e Click event.
      */
     handleClickOnPod_: function(e) {
       if (this.parentNode.disabled)
         return;
@@ skipping 1756 matching lines @@
        if (pod && pod.multiProfilesPolicyApplied) {
          pod.userTypeBubbleElement.classList.remove('bubble-shown');
        }
      }
   };
 
   return {
     PodRow: PodRow
   };
 });