Build nacl_helper_nonsfi with GN

ppapi/proxy/BUILD.gn

 # Copyright 2015 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/nacl/config.gni")
+
 config("proxy_implementation") {
   defines = [ "PPAPI_PROXY_IMPLEMENTATION" ]
 }
 
 component("proxy") {
   output_name = "ppapi_proxy"
 
   sources = [
     # Take some standalone files from the C++ wrapper allowing us to more
     # easily make async callbacks in the proxy. We can't depend on the
@@ skipping 259 matching lines @@
 
   deps = [
     "//base",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/ipc",
     "//ipc",
     "//media:shared_memory_support",
     "//ppapi/c",
     "//ppapi/proxy:ipc_sources",
     "//ppapi/shared_impl",
-    "//third_party/icu",
   ]
 
   if (!is_nacl) {
     deps += [
       "//base/third_party/dynamic_annotations",
       "//gin",
       "//skia",
       "//ui/events:events_base",
       "//ui/surface",
     ]
   }
+
+  if (!is_nacl_nonsfi) {
+    deps += [ "//third_party/icu" ]
+  }
 }
 
 group("ipc") {
   if (is_component_build) {
     public_deps = [
       "//ppapi/proxy",
     ]
   } else {
     public_deps = [
       ":ipc_sources",
@@ skipping 54 matching lines @@
   deps = [
     "//base/test:test_support",
     "//ipc",
     "//ipc:test_support",
     "//ppapi/proxy",
     "//ppapi/shared_impl",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }