[MD settings] vertical align left edge of icons and text

chrome/browser/resources/settings/people_page/users_page.html

 <link rel="import" href="chrome://resources/html/action_link.html">
 <link rel="import" href="chrome://resources/html/action_link_css.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="../controls/settings_toggle_button.html">
 <link rel="import" href="../settings_shared_css.html">
 <link rel="import" href="user_list.html">
 <link rel="import" href="users_add_user_dialog.html">
 
 <dom-module id="settings-users-page">
   <template>
     <style include="settings-shared action-link">
       .users {
         /* The users box must line up with the checkbox text. */
         -webkit-margin-start: var(--settings-indent-width);
       }
 
       .settings-box:first-of-type {
         border-top: none;
       }
 
       #add-user-button {
         /* Add user button must be lined up with the start of users' names. */
+        /* TODO(dschuyler): Should this be var(--settings-box-row-indent) rather
+           than 56px? */

[dschuyler, 2017/04/11 01:11:18]

I think this is likely, but it needs further investigation.

         -webkit-margin-start: 56px;
       }
     </style>
     <template is="dom-if" if="[[isWhitelistManaged_]]">
       <div class="settings-box">$i18n{settingsManagedLabel}</div>
     </template>
     <template is="dom-if" if="[[!isWhitelistManaged_]]">
       <template is="dom-if" if="[[!isOwner_]]">
         <div class="settings-box">$i18n{usersModifiedByOwnerLabel}</div>
       </template>
@@ skipping 33 matching lines @@
             $i18n{addUsers}
           </a>
         </div>
       </div>
     </div>
     <settings-users-add-user-dialog id="addUserDialog">
     </settings-users-add-user-dialog>
   </template>
   <script src="users_page.js"></script>
 </dom-module>