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

examples/wm_flow/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/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 assert(use_aura)
 
@@ skipping 14 matching lines @@
     "wm/frame_controller.h",
   ]
 
   deps = [
     "//base",
     "//skia",
     "//ui/aura",
     "//ui/views",
     "//ui/wm:wm",
     "//mojo/application",
-    "//mojo/public/c/system:for_shared_library",
     "//mojo/services/public/cpp/view_manager",
     "//mojo/services/public/interfaces/input_events",
     "//mojo/views:views",
     "//services/window_manager:lib",
   ]
 }
 
 mojo_native_application("app") {
   output_name = "wm_flow_app"
 
   sources = [
     "app/app.cc",
   ]
 
   deps = [
     ":embedder_bindings",
     ":embeddee_bindings",
     "//base",
     "//examples/bitmap_uploader",
     "//mojo/application",
-    "//mojo/public/c/system:for_shared_library",
     "//mojo/public/interfaces/application:application",
     "//mojo/services/public/cpp/view_manager",
     "//skia",
     "//services/window_manager:lib",
   ]
 }
 
 mojo_native_application("embedded") {
   output_name = "wm_flow_embedded"
 
   sources = [
     "embedded/embedded.cc",
   ]
 
   deps = [
     ":embeddee_bindings",
     ":embedder_bindings",
     "//base",
     "//examples/bitmap_uploader",
     "//mojo/application",
-    "//mojo/public/c/system:for_shared_library",
     "//mojo/services/public/cpp/view_manager",
     "//services/window_manager:lib",
     "//skia",
   ]
 }
 
 mojom("embedder_bindings") {
   sources = [
     "app/embedder.mojom",
   ]
 }
 
 mojom("embeddee_bindings") {
   sources = [
     "embedded/embeddee.mojom",
   ]
 }