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

device/bluetooth/bluetooth.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 105 matching lines @@
         'device_bluetooth',
       ],
       'include_dirs': [
         '../../',
       ],
       'sources': [
         'test/mock_bluetooth_adapter.cc',
         'test/mock_bluetooth_adapter.h',
         'test/mock_bluetooth_device.cc',
         'test/mock_bluetooth_device.h',
+        'test/mock_bluetooth_discovery_session.cc',
+        'test/mock_bluetooth_discovery_session.h',
         'test/mock_bluetooth_profile.cc',
         'test/mock_bluetooth_profile.h',
         'test/mock_bluetooth_socket.cc',
         'test/mock_bluetooth_socket.h',
       ],
     },
   ],
 }