Launch nexes from mojo_shell.

mojo/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/ui.gni")
+import("//mojo/nacl/config.gni")
 import("//mojo/public/mojo.gni")
 
 # TODO(beng): this meta target should probably move to the root dir's BUILD.gn.
 group("mojo") {
   # Meta-target, don't link into production code.
   testonly = true
   declare_args() {
     mojo_use_go = false
-    mojo_use_nacl = false
   }
   deps = [
     ":tests",
     "//benchmarks",
     "//examples",
     "//mojo/common",
     "//mojo/public",
     "//mojo/services",
     "//mojo/tools/package_manager",
     "//services",
@@ skipping 47 matching lines @@
     "//services/window_manager:window_manager_unittests",
   ]
 
   if (!is_asan) {
     deps += [
       "//mojo/dart/embedder/test:dart_unittests",
       "//services/dart:dart_apptests",
     ]
   }
 }