Replace more ObserverList with base::ObserverList.

chromeos/disks/mock_disk_mount_manager.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROMEOS_DISKS_MOCK_DISK_MOUNT_MANAGER_H_
 #define CHROMEOS_DISKS_MOCK_DISK_MOUNT_MANAGER_H_
 
 #include <string>
 
 #include "base/observer_list.h"
@@ skipping 85 matching lines @@
 
   // Notifies observers about device status update.
   void NotifyDeviceChanged(DeviceEvent event,
                            const std::string& path);
 
   // Notifies observers about disk status update.
   void NotifyDiskChanged(DiskEvent event,
                          const DiskMountManager::Disk* disk);
 
   // The list of observers.
-  ObserverList<DiskMountManager::Observer> observers_;
+  base::ObserverList<DiskMountManager::Observer> observers_;
 
   // The list of disks found.
   DiskMountManager::DiskMap disks_;
 
   // The list of existing mount points.
   DiskMountManager::MountPointMap mount_points_;
 
   DISALLOW_COPY_AND_ASSIGN(MockDiskMountManager);
 };
 
 }  // namespace disks
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DISKS_MOCK_DISK_MOUNT_MANAGER_H_