bluetooth: Shutdown BluetoothAdapter before DBus on ChromeOS.

device/bluetooth/test/mock_bluetooth_adapter.cc

 // Copyright (c) 2012 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_adapter.h"
 
 namespace device {
 
 MockBluetoothAdapter::Observer::Observer() {}
 MockBluetoothAdapter::Observer::~Observer() {}
 
 MockBluetoothAdapter::MockBluetoothAdapter() {
 }
 
 MockBluetoothAdapter::~MockBluetoothAdapter() {}
 
+#if defined(OS_CHROMEOS)
+void MockBluetoothAdapter::Shutdown() {
+}
+#endif
+
 void MockBluetoothAdapter::DeleteOnCorrectThread() const {
   delete this;
 };
 
 void MockBluetoothAdapter::AddDiscoverySession(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {}
 
 void MockBluetoothAdapter::RemoveDiscoverySession(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {}
 
 }  // namespace device