Fix closure compiling error of file manager.

third_party/closure_compiler/externs/file_manager_private.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.
 
 /** @fileoverview Externs generated from namespace: fileManagerPrivate */
 
 /**
  * @typedef {{
  *   taskId: string,
  *   title: string,
@@ skipping 183 matching lines @@
 
 /**
  * @typedef {{
  *   type: string,
  *   devicePath: string
  * }}
  */
 var DeviceEvent;
 
 /**
+ * @typedef {{
+ *   extensionId: string,
+ *   name: string,
+ *   canConfigure: boolean,
+ *   canAdd: boolean
+ * }}
+ */
+var ProvidingExtension;
+
+/**
  * @const
  */
 chrome.fileManagerPrivate = {};
 
 /**
  * Logout the current user for navigating to the re-authentication screen for
  * the Google account.
  */
 chrome.fileManagerPrivate.logoutUserForReauthentication = function() {};
 
@@ skipping 359 matching lines @@
  * @param {function()} callback
  */
 chrome.fileManagerPrivate.setEntryTag = function(entryURL, visibility, key, value, callback) {};
 
 /**
  * Gets a flag indicating whether PiexLoader is enabled.
  * @param {function(boolean)} callback
  */
 chrome.fileManagerPrivate.isPiexLoaderEnabled = function(callback) {};
 
+/**
+ * Returns list of available providing extensions.
+ * @param {function(!Array<!ProvidingExtension>)} callback
+ */
+chrome.fileManagerPrivate.getProvidingExtensions = function(callback) {};
+
+/**
+ * Requests adding a new provided file system. If not possible, then an error
+ * via chrome.runtime.lastError is returned.
+ * @param {string} extensionId
+ * @param {function()} callback
+ */
+chrome.fileManagerPrivate.addProvidedFileSystem =
+    function(extensionId, callback) {};
+
+/**
+ * Requests configuring an existing file system. If not possible, then returns
+ * an error via chrome.runtime.lastError.
+ * @param {string} volumeId
+ * @param {function()} callback
+ */
+chrome.fileManagerPrivate.configureProvidedFileSystem =
+    function(volumeId, callback) {};
+
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onMountCompleted;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onFileTransfersUpdated;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onCopyProgress;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDirectoryChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onPreferencesChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDriveConnectionStatusChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDeviceChanged;
 
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDriveSyncError;