Migrate chrome.bluetooth API backend to use device::BluetoothDiscoverySession.

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() {}
 
+void MockBluetoothAdapter::AddDiscoverySession(
+    const base::Closure& callback,
+    const ErrorCallback& error_callback) {}
+
+void MockBluetoothAdapter::RemoveDiscoverySession(
+    const base::Closure& callback,
+    const ErrorCallback& error_callback) {}
+
 }  // namespace device