Connect WebUSB client interface to the devices app

content/content_child.gypi

 # 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/mime_util/mime_util.gyp:mime_util',
     '../components/tracing.gyp:tracing',
     '../components/webcrypto/webcrypto.gyp:webcrypto',
@@ skipping 188 matching lines @@
       'child/request_info.cc',
       'child/request_info.h',
       'child/resource_dispatcher.cc',
       'child/resource_dispatcher.h',
       'child/resource_scheduling_filter.cc',
       'child/resource_scheduling_filter.h',
       'child/runtime_features.cc',
       'child/runtime_features.h',
       'child/scoped_child_process_reference.cc',
       'child/scoped_child_process_reference.h',
+      'child/scoped_web_callbacks.h',
       'child/shared_memory_data_consumer_handle.cc',
       'child/shared_memory_data_consumer_handle.h',
       'child/shared_memory_received_data_factory.cc',
       'child/shared_memory_received_data_factory.h',
       'child/service_worker/service_worker_dispatcher.cc',
       'child/service_worker/service_worker_dispatcher.h',
       'child/service_worker/service_worker_handle_reference.cc',
       'child/service_worker/service_worker_handle_reference.h',
       'child/service_worker/service_worker_message_filter.cc',
       'child/service_worker/service_worker_message_filter.h',
@@ skipping 114 matching lines @@
         'child/npapi/webplugin_delegate_impl_mac.mm',
       ],
     }],
     ['OS=="win"', {
       'sources!': [
         'child/npapi/webplugin_delegate_impl_aura.cc',
       ],
     }],
   ],
 }