Adding missing manifest to gn-built app_list_demo

ui/app_list/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("//testing/test.gni")
 
 component("app_list") {
   sources = [
     "app_list_constants.cc",
@@ skipping 226 matching lines @@
 
     sources = [
       "demo/app_list_demo_views.cc",
     ]
 
     deps = [
       ":app_list",
       ":test_support",
       "//base",
       "//build/config/sanitizers:deps",
+      "//build/win:default_exe_manifest",
       "//content",
       "//content/public/browser",
       "//skia",
       "//ui/base",
       "//ui/events",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/views",
       "//ui/views/controls/webview",
       "//ui/views_content_client",
@@ skipping 73 matching lines @@
       "cocoa/app_list_view_controller_unittest.mm",
       "cocoa/app_list_window_controller_unittest.mm",
       "cocoa/apps_grid_controller_unittest.mm",
       "cocoa/apps_search_box_controller_unittest.mm",
       "cocoa/apps_search_results_controller_unittest.mm",
       "cocoa/test/apps_grid_controller_test_helper.h",
       "cocoa/test/apps_grid_controller_test_helper.mm",
     ]
   }
 }