Change access mode of disk devices when mounting based on config.

chrome/browser/chromeos/login/kiosk_browsertest.cc

 // Copyright (c) 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.
 
 #include <memory>
 #include <vector>
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/desktop_background/desktop_background_controller_observer.h"
 #include "ash/shell.h"
@@ skipping 342 matching lines @@
   KioskFakeDiskMountManager() {}
 
   ~KioskFakeDiskMountManager() override {}
 
   void set_usb_mount_path(const std::string& usb_mount_path) {
     usb_mount_path_ = usb_mount_path;
   }
 
   void MountUsbStick() {
     DCHECK(!usb_mount_path_.empty());
-    MountPath(usb_mount_path_, "", "", chromeos::MOUNT_TYPE_DEVICE);
+    MountPath(usb_mount_path_, "", "", chromeos::MOUNT_TYPE_DEVICE,
+              chromeos::MOUNT_ACCESS_MODE_READ_ONLY);
   }
 
   void UnMountUsbStick() {
     DCHECK(!usb_mount_path_.empty());
     UnmountPath(usb_mount_path_,
                 UNMOUNT_OPTIONS_NONE,
                 disks::DiskMountManager::UnmountPathCallback());
   }
 
  private:
@@ skipping 2028 matching lines @@
   content::WindowedNotificationObserver(
       chrome::NOTIFICATION_KIOSK_AUTOLAUNCH_WARNING_VISIBLE,
       content::NotificationService::AllSources()).Wait();
 
   // Wait for the wallpaper to load.
   WaitForWallpaper();
   EXPECT_TRUE(wallpaper_loaded());
 }
 
 }  // namespace chromeos