components: Cleanup class/struct fwd declarations

components/proximity_auth/remote_device_life_cycle_impl.h

 // Copyright 2015 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 COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_IMPL_H
 #define COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_IMPL_H
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
 #include "components/proximity_auth/authenticator.h"
 #include "components/proximity_auth/messenger_observer.h"
 #include "components/proximity_auth/remote_device.h"
 #include "components/proximity_auth/remote_device_life_cycle.h"
 
 namespace proximity_auth {
 
 class BluetoothThrottler;
-class BluetoothLowEnergyDeviceWhitelist;
 class Messenger;
 class Connection;
 class ConnectionFinder;
 class ProximityAuthClient;
 class SecureContext;
 
 // Implementation of RemoteDeviceLifeCycle.
 class RemoteDeviceLifeCycleImpl : public RemoteDeviceLifeCycle,
                                   public MessengerObserver {
  public:
@@ skipping 81 matching lines @@
   base::OneShotTimer authentication_recovery_timer_;
 
   base::WeakPtrFactory<RemoteDeviceLifeCycleImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteDeviceLifeCycleImpl);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_IMPL_H