HostResolver is exposed to Native Client.

ppapi/native_client/src/shared/ppapi_proxy/ppapi_proxy.gyp

 # 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.
 
 {
   'includes': [
     '../../../../../native_client/build/common.gypi',
   ],
   'targets': [
     {
       'target_name': 'nacl_ppapi_browser',
       'type': 'static_library',
       'sources': [
         'browser_callback.cc',
         'browser_globals.cc',
         'browser_nacl_file_rpc_server.cc',
+        'browser_ppb_audio_config_rpc_server.cc',
         'browser_ppb_audio_rpc_server.cc',
-        'browser_ppb_audio_config_rpc_server.cc',
         'browser_ppb_core_rpc_server.cc',
         'browser_ppb_cursor_control_rpc_server.cc',
         'browser_ppb_file_io_rpc_server.cc',
         'browser_ppb_file_ref_rpc_server.cc',
         'browser_ppb_file_system_rpc_server.cc',
         'browser_ppb_find_rpc_server.cc',
         'browser_ppb_font_rpc_server.cc',
         'browser_ppb_fullscreen_rpc_server.cc',
         'browser_ppb_gamepad_rpc_server.cc',
         'browser_ppb_graphics_2d_rpc_server.cc',
         'browser_ppb_graphics_3d_rpc_server.cc',
+        'browser_ppb_host_resolver_private_rpc_server.cc',
         'browser_ppb_image_data_rpc_server.cc',
         'browser_ppb_input_event_rpc_server.cc',
         'browser_ppb_instance_rpc_server.cc',
         'browser_ppb_messaging_rpc_server.cc',
         'browser_ppb_mouse_lock_rpc_server.cc',
         'browser_ppb_net_address_private_rpc_server.cc',
         'browser_ppb_pdf_rpc_server.cc',
         'browser_ppb_rpc_server.cc',
         'browser_ppb_scrollbar_rpc_server.cc',
         'browser_ppb_tcp_server_socket_private_rpc_server.cc',
@@ skipping 31 matching lines @@
       'include_dirs': [
         '<(DEPTH)/ppapi/native_client/src/shared/ppapi_proxy/trusted',
         '<(DEPTH)/ppapi',
       ],
       'dependencies': [
         '<(DEPTH)/ppapi/ppapi.gyp:ppapi_c',
       ],
     },
   ],
 }