Do not try to link chrome or app_shell in chromeos gn build.

chrome/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/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_repack_locales.gni")
 import("//chrome/version.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
-if (!is_android) {
+if (!is_android && !is_chromeos) {
 
 # TODO(GYP) for Windows need to the the reorder-imports step which probably
 # means adding another target and renaming this to chrome_initial like in GYP.
 executable("chrome") {
   # Because the sources list varies so significantly per-platform, generally
   # each platform lists its own files rather than relying on filtering or
   # removing unused files.
   sources = [
     "app/chrome_exe_resource.h",
   ]
@@ skipping 558 matching lines @@
     "//chrome/browser/ui",
     "//chrome/plugin",
     "//chrome/renderer",
     "//chrome/utility",
     "//components/enhanced_bookmarks",
     "//content/public/app:browser",
   ]
 }
 
 }