Using data_deps instead of data in BUILD.gn for app list test components

ui/app_list/shower/BUILD.gn

 # Copyright 2016 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("//testing/test.gni")
 import("//build/config/ui.gni")
 
 assert(use_aura)
 
 component("shower") {
@@ skipping 31 matching lines @@
     "//base",
   ]
 }
 
 test("app_list_shower_unittests") {
   sources = [
     "app_list_shower_impl_unittest.cc",
     "test/run_all_unittests.cc",
   ]
 
-  # TODO: Add to data_deps instead once GN has rolled past #339778.
-  data = [
-    "$root_out_dir/ui_test.pak",
-  ]
-
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     ":shower",
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//testing/gtest",
     "//ui/app_list:test_support",
     "//ui/aura:aura",
     "//ui/aura:test_support",
     "//ui/base",
     "//ui/gl:test_support",
-    "//ui/resources:ui_test_pak",
     "//ui/wm:wm",
   ]
+
+  data_deps = [
+    "//ui/resources:ui_test_pak_data",
+  ]
 }