Propagate the read_only_hardware flag of volumes to js.

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 51 matching lines @@
  *   extensionId: (string|undefined),
  *   source: string,
  *   volumeLabel: (string|undefined),
  *   profile: ProfileInfo,
  *   sourcePath: (string|undefined),
  *   volumeType: string,
  *   deviceType: (string|undefined),
  *   devicePath: (string|undefined),
  *   isParentDevice: (boolean|undefined),
  *   isReadOnly: boolean,
+ *   isReadOnlyRemovableDevice: boolean,
  *   hasMedia: boolean,
  *   configurable: boolean,
  *   watchable: boolean,
  *   mountCondition: (string|undefined),
  *   mountContext: (string|undefined)
  * }}
  */
 var VolumeMetadata;
 
 /**
@@ skipping 609 matching lines @@
 /** @type {!ChromeEvent} */
 chrome.fileManagerPrivate.onDriveSyncError;
 
 /** @enum {string} */
 chrome.fileManagerPrivate.Verb = {
   OPEN_WITH: 'open_with',
   ADD_TO: 'add_to',
   PACK_WITH: 'pack_with',
   SHARE_WITH: 'share_with',
 };