Replace ExtensionInstallChecker with generic PreloadCheckGroup

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 3955 matching lines @@
       "../browser/extensions/extension_api_unittest.h",
       "../browser/extensions/extension_context_menu_model_unittest.cc",
       "../browser/extensions/extension_creator_filter_unittest.cc",
       "../browser/extensions/extension_error_controller_unittest.cc",
       "../browser/extensions/extension_function_test_utils.cc",
       "../browser/extensions/extension_function_test_utils.h",
       "../browser/extensions/extension_garbage_collector_chromeos_unittest.cc",
       "../browser/extensions/extension_garbage_collector_unittest.cc",
       "../browser/extensions/extension_gcm_app_handler_unittest.cc",
       "../browser/extensions/extension_icon_manager_unittest.cc",
-      "../browser/extensions/extension_install_checker_unittest.cc",
       "../browser/extensions/extension_install_prompt_unittest.cc",
       "../browser/extensions/extension_management_test_util.cc",
       "../browser/extensions/extension_management_test_util.h",
       "../browser/extensions/extension_management_unittest.cc",
       "../browser/extensions/extension_message_bubble_controller_unittest.cc",
       "../browser/extensions/extension_migrator_unittest.cc",
       "../browser/extensions/extension_navigation_throttle_unittest.cc",
       "../browser/extensions/extension_path_util_unittest.cc",
       "../browser/extensions/extension_prefs_unittest.cc",
       "../browser/extensions/extension_prefs_unittest.h",
@@ skipping 1244 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }