Add Linux support for the Bluetooth API.

device/bluetooth/test/mock_bluetooth_advertisement.cc

 // 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.
 
 #include "device/bluetooth/test/mock_bluetooth_advertisement.h"
 
 namespace device {
 
 MockBluetoothAdvertisement::MockBluetoothAdvertisement() {
 }
 
 MockBluetoothAdvertisement::~MockBluetoothAdvertisement() {
 }
 
 void MockBluetoothAdvertisement::Unregister(
     const SuccessCallback& success_callback,
     const ErrorCallback& error_callback) {
   success_callback.Run();
 }
 
-}  // namespace chromeos
+}  // namespace device