device: Cleanup class/struct forward declarations

device/bluetooth/bluetooth_low_energy_device_mac.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 DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 
 #if defined(OS_IOS)
 #import <CoreBluetooth/CoreBluetooth.h>
 #else  // !defined(OS_IOS)
 #import <IOBluetooth/IOBluetooth.h>
 #endif  // defined(OS_IOS)
 
 #include <stdint.h>
 
 #include <set>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "crypto/sha2.h"
 #include "device/bluetooth/bluetooth_device_mac.h"
 
 @class BluetoothLowEnergyPeripheralDelegate;
 
 namespace device {
 
 class BluetoothAdapterMac;
-class BluetoothLowEnergyDiscoverManagerMac;
 class BluetoothRemoteGattServiceMac;
 
 class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
     : public BluetoothDeviceMac {
  public:
   BluetoothLowEnergyDeviceMac(BluetoothAdapterMac* adapter,
                               CBPeripheral* peripheral);
   ~BluetoothLowEnergyDeviceMac() override;
 
   // BluetoothDevice overrides.
@@ skipping 95 matching lines @@
   // A local address for the device created by hashing the peripheral
   // identifier.
   std::string hash_address_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyDeviceMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_