Simplify the thunk targets since we don't support apps as components

examples/http_handler/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("//mojo/public/mojo_application.gni")
 
 mojo_native_application("http_handler") {
   sources = [
     "http_handler.cc"
   ]
 
   deps = [
     "//base",
     "//mojo/application",
-    "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/bindings",
     "//services/http_server",
     "//services/http_server/public",
     "//services/http_server/public:util",
   ]
 }