Change mojo application name to {name}.mojo

examples/content_handler_demo/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.
 
-shared_library("content_handler_demo") {
+import("//mojo/public/mojo_application.gni")
+
+mojo_native_application("content_handler_demo") {
   sources = [
     "content_handler_demo.cc"
   ]
 
   deps = [
     "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/application:standalone",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/utility",
     "//mojo/services/public/interfaces/content_handler",
   ]
 }