filemanager: Files App change necessary to use "drive/root". It still works with "drive".

chrome/browser/resources/file_manager/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.
 
 /**
  * Responsible for showing banners in the file list.
  * @param {DirectoryModel} directoryModel The model.
  * @param {VolumeManager} volumeManager The manager.
  * @param {DOMDocument} document HTML document.
  * @param {boolean} showOffers True if we should show offer banners.
@@ skipping 346 matching lines @@
           else
             self.showLowDriveSpaceWarning_(lowDiskSpace, sizeStats);
 
           // If disk space is low, check it more often. User can delete files
           // manually and we should not bother her with warning in this case.
           scheduleCheck(lowDiskSpace ? 1000 * 5 : 1000 * 30, root, threshold);
         });
   };
 
   // TODO(kaznacheev): Unify the two low space warning.
-  var root = PathUtil.getRootPath(currentPath);
+  var root = PathUtil.getTopDirectory(currentPath);
   if (root === RootDirectory.DOWNLOADS) {
     scheduleCheck(500, root, 0.2);
     this.showLowDriveSpaceWarning_(false);
   } else if (root === RootDirectory.DRIVE) {
     scheduleCheck(500, root, 0.1);
     this.showLowDownloadsSpaceWarning_(false);
   } else {
     scheduleCheck(0);
 
     this.showLowDownloadsSpaceWarning_(false);
@@ skipping 208 matching lines @@
  * @param {function} completeCallback To be called (may be directly) when
  *                                    this.newWelcome_ get ready.
  * @private
  */
 FileListBannerController.prototype.preparePromo_ = function(completeCallback) {
   if (this.newWelcome_ !== undefined)
     completeCallback();
   else
     (this.promoCallbacks_ = this.promoCallbacks_ || []).push(completeCallback);
 };