Rename is_chromeos in libjingle.

third_party/libjingle/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/crypto.gni")
 import("//build/config/features.gni")
 
 # From third_party/libjingle/libjingle.gyp's target_defaults.
 config("jingle_unexported_configs") {
   defines = [
@@ skipping 94 matching lines @@
   # TODO(GYP): Support these in GN.
   # if (is_bsd) {
   #   defines += [ "BSD" ]
   # }
   # if (is_openbsd) {
   #   defines += [ "OPENBSD" ]
   # }
   # if (is_freebsd) {
   #   defines += [ "FREEBSD" ]
   # }
-  if (is_chromeos) {
+  if (is_chromeos_ui) {
     defines += [ "CHROMEOS" ]
   }
 }
 
 # From third_party/libjingle/libjingle.gyp's target_defaults.
 config("jingle_all_dependent_configs") {
   if (is_debug) {
     # TODO(sergeyu): Fix libjingle to use NDEBUG instead of
     # _DEBUG and remove this define. See GYP file as well.
     defines = [ "_DEBUG" ]
@@ skipping 382 matching lines @@
       "$p2p_dir/stunprober/stunprober.cc",
     ]
 
     deps = [
       "//third_party/webrtc/base:rtc_base",
       ":libjingle_webrtc_common",
     ]
   }
 }  # enable_webrtc
 # TODO(GYP): Port libjingle.gyp's enable_webrtc condition block.