bluetooth: Remove callback from BluetoothGattConnection::Disconnect

device/bluetooth/bluetooth_gatt_connection.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_CONNECTION_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_GATT_CONNECTION_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 16 matching lines @@
   // a possible error via the callback.
   virtual ~BluetoothGattConnection();
 
   // Returns the Bluetooth address of the device that this connection is open
   // to.
   virtual std::string GetDeviceAddress() const = 0;
 
   // Returns true if this connection is open.
   virtual bool IsConnected() = 0;
 
-  // Disconnects this GATT connection and calls |callback| upon completion.
-  // After a successful invocation, the device may still remain connected due to
-  // other GATT connections.
-  virtual void Disconnect(const base::Closure& callback) = 0;
+  // Disconnects this GATT connection. The device may still remain connected due
+  // to other GATT connections.
+  virtual void Disconnect() = 0;
 
  protected:
   BluetoothGattConnection();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BluetoothGattConnection);
 };
 
 }  // namespace device
 
 #endif  //  DEVICE_BLUETOOTH_BLUETOOTH_GATT_CONNECTION_H_