Remove some dead app host code.

chrome/browser/ui/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
@@ skipping 322 matching lines @@
     sources += rebase_path(gypi_values.chrome_browser_ui_win_sources,
                            ".", "//chrome")
     deps += [
       "//third_party/wtl",
       "//third_party/iaccessible2",
       "//third_party/isimpledom",
       "//ui/app_list",
       "//ui/views",
       "//ui/views/controls/webview",
       #'installer_util_strings',  TODO(GYP)
-      #'launcher_support',  TODO(GYP)
       #'metro_utils',  TODO(GYP)
       #'../google_update/google_update.gyp:google_update',  TODO(GYP)
     ]
     forward_dependent_configs_from += [
       "//ui/views",
       "//ui/views/controls/webview",
     ]
   } else {  # 'OS!="win"
     if (use_aura) {
       deps += [
@@ skipping 58 matching lines @@
   }
   if (enable_service_discovery) {
     sources += rebase_path(
         gypi_values.chrome_browser_ui_service_discovery_sources,
         ".", "//chrome")
   }
   if (enable_spellcheck) {
     deps += [ "//third_party/hunspell" ]
   }
 }