components: Cleanup class/struct fwd declarations

components/proximity_auth/bluetooth_connection_finder.h

 // 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.
 
 #ifndef COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
 #define COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "components/proximity_auth/bluetooth_util.h"
 #include "components/proximity_auth/connection_finder.h"
 #include "components/proximity_auth/connection_observer.h"
 #include "components/proximity_auth/remote_device.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 
 namespace proximity_auth {
 
-class BluetoothConnection;
-
 // This ConnectionFinder implementation tries to find a Bluetooth connection to
 // the remote device by polling at a fixed interval.
 class BluetoothConnectionFinder : public ConnectionFinder,
                                   public ConnectionObserver,
                                   public device::BluetoothAdapter::Observer {
  public:
   BluetoothConnectionFinder(const RemoteDevice& remote_device,
                             const device::BluetoothUUID& uuid,
                             const base::TimeDelta& polling_interval);
   ~BluetoothConnectionFinder() override;
@@ skipping 81 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BluetoothConnectionFinder);
 };
 
 // TODO(isherman): Make sure to wire up the controller to listen for screen lock
 // state change events, and create or destroy the connection finder as
 // appropriate.
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H