Windows fixes for GN build.

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")
 
 # From third_party/libjingle/libjingle.gyp's target_defaults.
 config("jingle_unexported_configs") {
   defines = [
     "EXPAT_RELATIVE_PATH",
@@ skipping 237 matching lines @@
     "source/talk/p2p/base/constants.h",
   ]
   deps = [
     # TODO(GYP): Uncomment when WebRTC GN build has settled.
     # "//third_party/webrtc/base:webrtc_base",
     ":libjingle_p2p_constants",
     ":jingle_deps"
   ]
 
   # From libjingle_common.gypi's conditions list.
-  if (is_win && !nacl_untrusted_build) {
-    cflags += [ "/wd4005", "\wd4267" ]
+  if (is_win) {
+    cflags = [ "/wd4005", "/wd4267" ]
   }
 
   forward_dependent_configs_from = [
     ":jingle_deps"
   ]
   configs += [
     ":jingle_unexported_configs"
   ]
   direct_dependent_configs = [
     ":jingle_direct_dependent_configs",
@@ skipping 60 matching lines @@
     ":jingle_unexported_configs"
   ]
   direct_dependent_configs = [
     ":jingle_direct_dependent_configs",
   ]
   all_dependent_configs = [
     ":jingle_all_dependent_configs",
   ]
   if (is_win) {
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags += [ "/wd4309" ]
+    cflags = [ "/wd4309" ]
   }
 }
 
 # TODO(GYP): Port libjingle.gyp's enable_webrtc condition block.