Fix two container issues for new login screen

ui/login/account_picker/md_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 3104 matching lines @@
      */
     rebuildPods: function() {
       var emptyPodRow = this.pods.length == 0;
 
       // Clear existing pods.
       this.innerHTML = '';
       this.focusedPod_ = undefined;
       this.activatedPod_ = undefined;
       this.lastFocusedPod_ = undefined;
       this.mainPod_ = undefined;
+      this.smallPodsContainer.innerHTML = '';
 
       // Switch off animation
       Oobe.getInstance().toggleClass('flying-pods', false);
 
       for (var i = 0; i < this.users_.length; ++i)
         this.addUserPod(this.users_[i]);
 
       for (var i = 0, pod; pod = this.pods[i]; ++i)
         this.podsWithPendingImages_.push(pod);
 
@@ skipping 1351 matching lines @@
       if (pod && pod.multiProfilesPolicyApplied) {
         pod.userTypeBubbleElement.classList.remove('bubble-shown');
       }
     }
   };
 
   return {
     PodRow: PodRow
   };
 });