Build nacl_helper_nonsfi with GN

ipc/BUILD.gn

Index: ipc/BUILD.gn
diff --git a/ipc/BUILD.gn b/ipc/BUILD.gn
index 336d8d6974a240cbd65f92ff263ac6262b68952f..dcc392e5df5ef8b3286a1f6ac47bbecc5c145f1c 100644
--- a/ipc/BUILD.gn
+++ b/ipc/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/nacl/config.gni")
 import("//testing/test.gni")
 
 component("ipc") {
@@ -100,7 +101,7 @@ component("ipc") {
     "unix_domain_socket_util.h",
   ]
 
-  if (is_nacl) {
+  if (is_nacl && !is_nacl_nonsfi) {
     sources -= [
       "ipc_channel.cc",
       "ipc_channel_posix.cc",
@@ -113,7 +114,7 @@ component("ipc") {
     ]
   }
 
-  if (is_win || is_ios) {
+  if (is_win || is_ios || is_nacl_nonsfi) {
     sources -= [ "unix_domain_socket_util.cc" ]
   }