Enable find-missing-symbols-at-link-time for chromeos builds too.

ui/chromeos/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.
 
 component("ui_chromeos") {
   sources = [
     "accessibility_types.h",
     "ime/candidate_view.cc",
     "ime/candidate_view.h",
     "ime/candidate_window_view.cc",
@@ skipping 21 matching lines @@
     "network/network_state_notifier.cc",
     "network/network_state_notifier.h",
     "touch_exploration_controller.cc",
     "touch_exploration_controller.h",
     "user_activity_power_manager_notifier.cc",
     "user_activity_power_manager_notifier.h",
   ]
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
+    "//chromeos:chromeos",
     "//chromeos:power_manager_proto",
     "//skia",
     "//ui/aura",
+    "//ui/base",
     "//ui/chromeos/resources",
     "//ui/chromeos/strings",
     "//ui/events",
     "//ui/events:gesture_detection",
+    "//ui/gfx",
+    "//ui/gfx/geometry",
     "//ui/message_center",
     "//ui/views",
     "//ui/wm",
   ]
   defines = [ "UI_CHROMEOS_IMPLEMENTATION" ]
 }
 
 test("ui_chromeos_unittests") {
   sources = [
     "ime/candidate_view_unittest.cc",
@@ skipping 11 matching lines @@
     "//skia",
     "//testing/gtest",
     "//ui/aura:test_support",
     "//ui/compositor",
     "//ui/message_center",
     "//ui/resources:ui_test_pak",
     "//ui/views",
     "//ui/views:test_support",
   ]
 }