Build nacl_helper_nonsfi with GN

base/process/BUILD.gn

Index: base/process/BUILD.gn
diff --git a/base/process/BUILD.gn b/base/process/BUILD.gn
index 76d83695cdb5fbc075e92596846d8040dd54cbed..8c7cc8a109a8e25ae64d197142e201cfbc34de63 100644
--- a/base/process/BUILD.gn
+++ b/base/process/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("process") {
   sources = [
     "internal_linux.cc",
@@ -82,10 +84,6 @@ source_set("process") {
     sources -= [
       "kill.cc",
       "kill.h",
-      "kill_posix.cc",
-      "launch.cc",
-      "launch.h",
-      "launch_posix.cc",
       "memory.cc",
       "memory.h",
       "process_iterator.cc",
@@ -94,6 +92,14 @@ source_set("process") {
       "process_metrics_posix.cc",
       "process_posix.cc",
     ]
+    if (!is_nacl_nonsfi) {
+      sources -= [
+        "kill_posix.cc",
+        "launch.cc",
+        "launch.h",
+        "launch_posix.cc",
+      ]
+    }
   }
 
   if (is_nacl) {