Discard unused AppListPrefs code.

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 4781 matching lines @@
   }
   if (enable_app_list) {
     sources += [
       "../browser/apps/drive/drive_app_mapping_unittest.cc",
       "../browser/ui/app_list/app_context_menu_unittest.cc",
       "../browser/ui/app_list/app_list_positioner_unittest.cc",
       "../browser/ui/app_list/app_list_service_unittest.cc",
       "../browser/ui/app_list/app_list_test_util.cc",
       "../browser/ui/app_list/app_list_test_util.h",
       "../browser/ui/app_list/extension_app_model_builder_unittest.cc",
-      "../browser/ui/app_list/model_pref_updater_unittest.cc",
       "../browser/ui/app_list/profile_loader_unittest.cc",
       "../browser/ui/app_list/search/app_search_provider_unittest.cc",
       "../browser/ui/app_list/search/history_unittest.cc",
       "../browser/ui/app_list/search/omnibox_result_unittest.cc",
       "../browser/ui/app_list/search/suggestions/suggestions_search_provider_unittest.cc",
       "../browser/ui/app_list/speech_auth_helper_unittest.cc",
       "../browser/ui/app_list/test/fake_profile.cc",
       "../browser/ui/app_list/test/fake_profile.h",
       "../browser/ui/app_list/test/fake_profile_store.cc",
       "../browser/ui/app_list/test/fake_profile_store.h",
@@ skipping 214 matching lines @@
       "touch_hud",
       "ui",
     ]
 
     if (is_linux && !is_android) {
       deps += [ "//components/font_service:manifest" ]
       packaged_services += [ "font_service" ]
     }
   }
 }