Propagate the read_only_hardware flag of volumes to js.

chrome/common/extensions/api/file_manager_private.idl

 // Copyright 2013 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.
 
 // fileManagerPrivate API.
 // This is a private API used by the file browser of ChromeOS.
 [platforms=("chromeos"),
  implemented_in="chrome/browser/chromeos/extensions/file_manager/file_manager_private_api_functions.h"]
 namespace fileManagerPrivate {
 // Type of the mounted volume.
@@ skipping 329 matching lines @@
   // Path to identify the device. This is consistent with DeviceEvent's
   // devicePath.
   DOMString? devicePath;
 
   // Whether the device is parent or not (i.e. sdb rather than sdb1).
   boolean? isParentDevice;
 
   // Flag that specifies if volume is mounted in read-only mode.
   boolean isReadOnly;
 
+  // Flag that specifies if the device is write-protected.
+  // Valid only for the volumes of removable device partitions.
+  boolean isReadOnlyRemovableDevice;
+
   // Flag that specifies whether the volume contains media.
   boolean hasMedia;
 
   // Flag that specifies whether the volume is configurable.
   boolean configurable;
 
   // Flag that specifies whether the volume is watchable.
   boolean watchable;
 
   // Additional data about mount, for example, that the filesystem is not
@@ skipping 636 matching lines @@
 
   static void onPreferencesChanged();
 
   static void onDriveConnectionStatusChanged();
 
   static void onDeviceChanged(DeviceEvent event);
 
   static void onDriveSyncError(DriveSyncErrorEvent event);
 };
 };