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

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

Index: chrome/browser/resources/settings/people_page/manage_profile.js
diff --git a/chrome/browser/resources/settings/people_page/manage_profile.js b/chrome/browser/resources/settings/people_page/manage_profile.js
index ced1cf688ac133ef277693520441a3891c25ef78..e7f2901894ed870cb3fa312fb1167d3f6a3686e7 100644
--- a/chrome/browser/resources/settings/people_page/manage_profile.js
+++ b/chrome/browser/resources/settings/people_page/manage_profile.js
@@ -33,6 +33,12 @@ Polymer({
     },
 
     /**
+     * The current sync status.
+     * @type {?settings.SyncStatus}
+     */
+    syncStatus: Object,
+
+    /**
      * @private {!settings.ManageProfileBrowserProxy}
      */
     browserProxy_: {
@@ -75,4 +81,13 @@ Polymer({
     this.browserProxy_.setProfileIconAndName(event.detail.selected,
                                              this.profileName);
   },
+
+  /**
+   * @param {?settings.SyncStatus} syncStatus
+   * @return {boolean} Whether the profile name field is disabled.
+   * @private
+   */
+  isProfileNameDisabled_: function(syncStatus) {
+    return !!syncStatus.supervisedUser && !syncStatus.childUser;
+  },
 });