Add an even simpler standalone example.

examples/hello_mojo/BUILD.gn

-# Copyright 2014 The Chromium Authors. All rights reserved.
+# Copyright 2016 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("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
-group("bank_app") {
+group("hello_mojo") {
   deps = [
-    ":customer",
-    ":bank",
+    ":hello_mojo_client",
+    ":hello_mojo_server",
   ]
 }
 
-mojo_native_application("customer") {
-  output_name = "customer"
-
+mojo_native_application("hello_mojo_client") {
   deps = [
-    ":bindings",
+    ":hello_mojo_interface",
+    "//mojo/public/c/system",
     "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
-    "//mojo/services/vanadium/security/interfaces",
   ]
 
   sources = [
-    "customer.cc",
+    "hello_mojo_client.cc",
   ]
 }
 
-mojo_native_application("bank") {
-  output_name = "bank"
-
+mojo_native_application("hello_mojo_server") {
   deps = [
-    ":bindings",
-    "//mojo/common",
+    ":hello_mojo_interface",
+    "//mojo/public/c/system",
     "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/bindings",
+    "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
-    "//mojo/services/vanadium/security/interfaces",
   ]
 
   sources = [
-    "bank.cc",
+    "hello_mojo_server.cc",
   ]
 }
 
-mojom("bindings") {
+mojom("hello_mojo_interface") {
   sources = [
-    "bank.mojom",
+    "hello_mojo.mojom",
   ]
 }