cros: Minor issues regarding submit button and tabbing on user pod fixed.

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 1424 matching lines @@
     },
 
     /**
      * Resets the input field and updates the tab order of pod controls.
      * @param {boolean} takeFocus If true, input field takes focus.
      */
     reset: function(takeFocus) {
       this.passwordElement.value = '';
       if (this.pinKeyboard)
         this.pinKeyboard.value = '';
+      this.updateInput_();
       this.classList.toggle('signing-in', false);
       if (takeFocus) {
         if (!this.multiProfilesPolicyApplied)
           this.focusInput();  // This will set a custom tab order.
       }
       else
         this.resetTabOrder();
     },
 
     /**
@@ skipping 2195 matching lines @@
        if (pod && pod.multiProfilesPolicyApplied) {
          pod.userTypeBubbleElement.classList.remove('bubble-shown');
        }
      }
   };
 
   return {
     PodRow: PodRow
   };
 });