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

ui/display/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")
 
 component("display") {
   sources = [
     "chromeos/configure_displays_task.cc",
     "chromeos/configure_displays_task.h",
@@ skipping 37 matching lines @@
       "//build/config/linux:xrandr",
     ]
     deps += [ "//ui/events/platform" ]
     if (is_chromeos) {
       sources -= [ "chromeos/ozone/display_configurator_ozone.cc" ]
     }
   }
 
   if (is_chromeos) {
     deps += [ "//ui/display/types" ]
+    if (use_x11) {
+      deps += [ "//ui/gfx/x" ]
+    }
   }
 
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
     if (is_chromeos) {
       sources -= [
         "chromeos/x11/display_configurator_x11.cc",
         "chromeos/x11/display_mode_x11.cc",
         "chromeos/x11/display_mode_x11.h",
         "chromeos/x11/display_snapshot_x11.cc",
@@ skipping 81 matching lines @@
     ]
   }
 
   if (use_ozone && is_chromeos) {
     sources -= [
       "chromeos/x11/display_util_x11_unittest.cc",
       "chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     ]
   }
 }