It is time.

sky/viewer/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("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojo_native_application("viewer") {
   output_name = "sky_viewer"
 
@@ skipping 46 matching lines @@
     "//mojo/services/surfaces/public/interfaces",
     "//mojo/services/view_manager/public/cpp",
     "//net",
     "//skia",
     "//sky/compositor",
     "//sky/engine",
     "//sky/engine/v8_inspector",
     "//sky/services/inspector:bindings",
     "//sky/services/testing:bindings",
     "//third_party/icu",
-    "//ui/native_theme",
     "//url",
   ]
 }
 
 mojom("bindings") {
   sources = [
     "services/inspector.mojom",
   ]
 }
 
 copy("sky_modules") {
   sources = [
     "script/core.sky",
     "script/support.sky",
     "script/threading.sky",
   ]
   outputs = [
     "$root_gen_dir/mojo/public/sky/{{source_file_part}}",
   ]
 }