Build NaCl in the CrOS GN builds and make sure "all" works

remoting/host/it2me/BUILD.gn

 # Copyright 2014 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("//remoting/remoting_host.gni")
 import("//remoting/remoting_srcs.gni")
 
 source_set("common") {
   sources = rebase_path(
           remoting_host_srcs_gypi_values.remoting_it2me_host_static_sources,
           ".",
           "//remoting")
 
   configs += [
     "//build/config/compiler:wexit_time_destructors",
     "//remoting:version",
   ]
 
   deps = [
     "//base:i18n",
     "//net:net",
     "//remoting/base",
     "//remoting/host",
     "//remoting/protocol",
     "//remoting/resources",
   ]
 }
 
-if (!is_win && enable_remoting_host) {
+if (!is_win && !is_chromeos && enable_remoting_host) {
   executable("remote_assistance_host") {
     sources = [
       "it2me_native_messaging_host_entry_point.cc",
       "it2me_native_messaging_host_main.cc",
       "it2me_native_messaging_host_main.h",
     ]
 
     configs += [
       "//build/config/compiler:wexit_time_destructors",
       "//remoting:version",
@@ skipping 10 matching lines @@
 
     if (enable_webrtc) {
       deps += [ "//third_party/libjingle:libjingle_webrtc" ]
     }
 
     if (is_desktop_linux) {
       deps += [ "//build/config/linux/gtk2" ]
     }
   }
 }