MD User manager: Migrate from PaperDialogBehavior to cr-dialog.

chrome/browser/resources/md_user_manager/import_supervised_user.js

 // Copyright 2016 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 'import-supervised-user' is a dialog that allows user to select
  * a supervised profile from a list of profiles to import on the current device.
  */
 (function() {
 /**
@@ skipping 32 matching lines @@
       }
     },
 
     /**
      * Index of the selected supervised user.
      * @private {number}
      */
     supervisedUserIndex_: {type: Number, value: NO_USER_SELECTED}
   },
 
-  /** override */
-  ready: function() {
-    this.$.dialog.lastFocusableNode = this.$.cancel;
-  },
-
   /**
    * Displays the dialog.
    * @param {(!SignedInUser|undefined)} signedInUser
    * @param {!Array<!SupervisedUser>} supervisedUsers
    */
   show: function(signedInUser, supervisedUsers) {
     this.supervisedUsers_ = supervisedUsers;
     this.supervisedUsers_.sort(function(a, b) {
       if (a.onCurrentDevice != b.onCurrentDevice)
         return a.onCurrentDevice ? 1 : -1;
       return a.name.localeCompare(b.name);
     });
 
     this.supervisedUserIndex_ = NO_USER_SELECTED;
 
     this.signedInUser_ = signedInUser || null;
     if (this.signedInUser_)
-      this.$.dialog.open();
+      this.$.dialog.showModal();
   },
 
   /**
-   * param {number} supervisedUserIndex Index of the selected supervised user.
+   * @param {number} supervisedUserIndex Index of the selected supervised user.
+   * @return {boolean} Whether the 'Import' button should be disabled.
    * @private
-   * @return {boolean} Whether the 'Import' button should be disabled.
    */
   isImportDisabled_: function(supervisedUserIndex) {
-    var disabled = supervisedUserIndex == NO_USER_SELECTED;
-    if (!disabled) {
-      this.$.dialog.lastFocusableNode = this.$.import;
-    }
-    return disabled;
+    return supervisedUserIndex == NO_USER_SELECTED;
   },
 
   /**
    * Called when the user clicks the 'Import' button. it proceeds with importing
    * the supervised user.
    * @private
    */
   onImportTap_: function() {
     var supervisedUser = this.supervisedUsers_[this.supervisedUserIndex_];
     if (this.signedInUser_ && supervisedUser) {
       this.$.dialog.close();
       // Event is caught by create-profile.
       this.fire(
           'import',
           {supervisedUser: supervisedUser, signedInUser: this.signedInUser_});
     }
-  }
+  },
+
+  /** @private */
+  onCancelTap_: function() {
+    this.$.dialog.close();
+  },
 });
 })();