device: Cleanup class/struct forward declarations

device/bluetooth/bluetooth_gatt_characteristic.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 DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_
 
 #include <stdint.h>
 #include <string>
 
 #include "base/callback.h"
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_gatt_service.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 
 namespace device {
 
-class BluetoothRemoteGattDescriptor;
-class BluetoothGattNotifySession;
-
 // BluetoothGattCharacteristic represents a local or remote GATT characteristic.
 // A GATT characteristic is a basic data element used to construct a GATT
 // service. Hence, instances of a BluetoothGattCharacteristic are associated
 // with a BluetoothGattService.
 class DEVICE_BLUETOOTH_EXPORT BluetoothGattCharacteristic {
  public:
   // Values representing the possible properties of a characteristic, which
   // define how the characteristic can be used. Each of these properties serve
   // a role as defined in the Bluetooth Specification.
   // |PROPERTY_EXTENDED_PROPERTIES| is a special property that, if present,
@@ skipping 73 matching lines @@
   BluetoothGattCharacteristic();
   virtual ~BluetoothGattCharacteristic();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattCharacteristic);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_GATT_CHARACTERISTIC_H_