bluetooth: Remove callback from BluetoothGattConnection::Disconnect

device/bluetooth/bluetooth_gatt_connection.h

Index: device/bluetooth/bluetooth_gatt_connection.h
diff --git a/device/bluetooth/bluetooth_gatt_connection.h b/device/bluetooth/bluetooth_gatt_connection.h
index 81e1c8e43b13f159554dd976ca40150cd9f7d5e8..1f90636ccc342ac1c33625ceb8c62f02d98482a2 100644
--- a/device/bluetooth/bluetooth_gatt_connection.h
+++ b/device/bluetooth/bluetooth_gatt_connection.h
@@ -34,10 +34,9 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothGattConnection {
   // 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();