Remove dependency on internal_mac-inl.h

remoting/build/config/BUILD.gn

 # Copyright 2016 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.
 
 import("//build/config/features.gni")
 import("//build/util/version.gni")
 import("//remoting/remoting_options.gni")
 
 # TODO(nicholss): Move this and other defines to version.h.in.
 # Various remoting targets need this version definition.
 config("version") {
   defines = [ "VERSION=$chrome_version_full" ]
 }
 
 config("enable_webrtc_remoting_client") {
   if (!is_official_build && !is_nacl) {
     defines = [ "ENABLE_WEBRTC_REMOTING_CLIENT=1" ]
   }
 }
 
 config("remoting_me2me_host") {
   defines = []
 
-  if (is_mac && is_official_build) {
-    defines += [ "USE_REMOTING_MACOSX_INTERNAL" ]
-  }
-
   if (is_win && remoting_multi_process != 0 && remoting_rdp_session != 0) {
     defines += [ "REMOTING_RDP_SESSION" ]
   }
 
   if (remoting_multi_process != 0) {
     defines += [ "REMOTING_MULTI_PROCESS" ]
   }
 }