Fix missing "..." in the supervised user import dialog.

chrome/browser/resources/options/supervised_user_import.css

 /* 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. */
 
 #supervised-user-import {
   width: 612px;
 }
 
 #supervised-user-import-text,
 #supervised-user-select-avatar-text {
   padding-bottom: 10px;
   padding-left: 17px;
   white-space: pre-wrap;
   word-wrap: break-word;
 }
 
 #supervised-user-list {
   height: 240px;
   margin-bottom: 10px;
 }
 
+#supervised-user-list .list-item {
+  align-items: center;
+  display: flex;
+}
+
+#supervised-user-list .profile-img {
+  flex-shrink: 0;
+}
+
 #supervised-user-list .profile-name {
-  flex: 1;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
 #supervised-user-list > * {
   height: 40px;
 }
 
 #supervised-user-list:focus {
@@ skipping 29 matching lines @@
 }
 
 .profile-name-disabled {
   color: rgb(153, 153, 153);
 }
 
 .already-on-this-device {
   padding-left: 20px;
   padding-right: 6px;
 }