Simplify fileBrowserPrivate.getDriveConnectionStatus().

chrome/browser/resources/file_manager/foreground/js/drive_banners.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /**
  * Responsible for showing following banners in the file list.
  *  - WelcomeBanner
  *  - AuthFailBanner
@@ skipping 635 matching lines @@
   }
 };
 
 /**
  * Updates the visibility of Drive Connection Warning banner, retrieving the
  * current connection information.
  * @private
  */
 FileListBannerController.prototype.maybeShowAuthFailBanner_ = function() {
   var connection = this.volumeManager_.getDriveConnectionState();
-  var reasons = connection.reasons;
   var showDriveNotReachedMessage =
       this.isOnCurrentProfileDrive() &&
       connection.type == util.DriveConnectionType.OFFLINE &&
-      // Show the banner only when authentication fails. Don't show it when the
-      // drive service is disabled.
-      reasons.indexOf(util.DriveConnectionReason.NOT_READY) != -1 &&
-      reasons.indexOf(util.DriveConnectionReason.NO_SERVICE) == -1;
+      connection.reason == util.DriveConnectionReason.NOT_READY;
   this.authFailedBanner_.hidden = !showDriveNotReachedMessage;
 };