[MD Settings][People] Disables profile name field for legacy supervised users.

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

 <link rel="import" href="chrome://resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/shadow.html">
 <link rel="import" href="/people_page/manage_profile_browser_proxy.html">
 <link rel="import" href="/settings_shared_css.html">
 
 <dom-module id="settings-manage-profile">
   <template>
     <style include="settings-shared">
       #selector {
         margin: 16px 20px;
       }
     </style>
     <div class="settings-box first">
       <paper-input id="name" value="{{profileName}}" pattern=".*\S.*"
-          auto-validate required on-change="onProfileNameChanged_">
+          auto-validate required on-change="onProfileNameChanged_"
+          disabled="[[isProfileNameDisabled_(syncStatus)]]">
       </paper-input>
     </div>
     <cr-profile-avatar-selector id="selector" avatars="[[availableIcons]]"
         selected-avatar-url="{{profileIconUrl}}"
         on-iron-activate="onIconActivate_">
     </cr-profile-avatar-selector>
   </template>
   <script src="manage_profile.js"></script>
 </dom-module>