Files.app: Fix closure error which will raised by the updated compiler.

ui/file_manager/file_manager/foreground/js/import_controller.js

 // Copyright 2014 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.
 
 // Namespace
 var importer = importer || {};
 
 /** @private @enum {string} */
 importer.ActivityState = {
   READY: 'ready',
@@ skipping 862 matching lines @@
 importer.ControllerEnvironment = function() {};
 
 /**
  * Returns the current file selection, if any. May be empty.
  * @return {!Array.<!Entry>}
  */
 importer.ControllerEnvironment.prototype.getSelection;
 
 /**
  * Returns the directory entry for the current directory.
- * @return {DirectoryEntry}
+ * @return {DirectoryEntry|FakeEntry}
  */
 importer.ControllerEnvironment.prototype.getCurrentDirectory;
 
 /**
  * @param {!DirectoryEntry} entry
  */
 importer.ControllerEnvironment.prototype.setCurrentDirectory;
 
 /**
  * Returns true if the Drive mount is present.
@@ skipping 232 matching lines @@
       .catch(importer.getLogger().catcher('import-destination-provision'));
 };
 
 /** @override */
 importer.RuntimeControllerEnvironment.prototype.showImportDestination =
     function(date) {
   return this.getImportDestination(date)
       .then(this.revealDirectory_.bind(this))
       .catch(importer.getLogger().catcher('import-destination-reveal'));
 };