Build nacl_helper_nonsfi with GN

third_party/libevent/BUILD.gn

Index: third_party/libevent/BUILD.gn
diff --git a/third_party/libevent/BUILD.gn b/third_party/libevent/BUILD.gn
index a1bd0c5792a4fbd095a6b9bad313215069b5db5c..61be1d788d84f4fdb95d8c1af511a31dbae1b6fd 100644
--- a/third_party/libevent/BUILD.gn
+++ b/third_party/libevent/BUILD.gn
@@ -2,6 +2,8 @@
 # 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")
+
 source_set("libevent") {
   sources = [
     "buffer.c",
@@ -31,6 +33,22 @@ source_set("libevent") {
   } else if (is_android) {
     sources += [ "epoll.c" ]
     include_dirs = [ "android" ]
+  } else if (is_nacl_nonsfi) {
+    sources -= [
+      "evdns.c",
+      "event_tagging.c",
+      "evrpc.c",
+      "http.c",
+      "select.c",
+      "signal.c",
+    ]
+    sources += [
+      "nacl_nonsfi/config.h",
+      "nacl_nonsfi/event-config.h",
+      "nacl_nonsfi/random.c",
+      "nacl_nonsfi/signal_stub.c",
+    ]
+    include_dirs = [ "nacl_nonsfi" ]
   }
 
   configs -= [ "//build/config/compiler:chromium_code" ]