Replace ExtensionInstallChecker with generic PreloadCheckGroup

extensions/browser/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/features.gni")
 import("//extensions/features/features.gni")
 
 group("browser") {
   public_deps = [
     "//extensions/browser:browser_context_keyed_service_factories",
@@ skipping 212 matching lines @@
       "notification_types.cc",
       "notification_types.h",
       "null_app_sorting.cc",
       "null_app_sorting.h",
       "policy_check.cc",
       "policy_check.h",
       "pref_names.cc",
       "pref_names.h",
       "preload_check.cc",
       "preload_check.h",
+      "preload_check_group.cc",
+      "preload_check_group.h",
       "process_manager.cc",
       "process_manager.h",
       "process_manager_delegate.h",
       "process_manager_factory.cc",
       "process_manager_factory.h",
       "process_manager_observer.h",
       "process_map.cc",
       "process_map.h",
       "process_map_factory.cc",
       "process_map_factory.h",
@@ skipping 199 matching lines @@
     "extension_throttle_unittest.cc",
     "file_highlighter_unittest.cc",
     "file_reader_unittest.cc",
     "image_loader_unittest.cc",
     "info_map_unittest.cc",
     "lazy_background_task_queue_unittest.cc",
     "load_monitoring_extension_host_queue_unittest.cc",
     "management_policy_unittest.cc",
     "mojo/keep_alive_impl_unittest.cc",
     "policy_check_unittest.cc",
+    "preload_check_group_unittest.cc",
     "process_manager_unittest.cc",
     "process_map_unittest.cc",
     "quota_service_unittest.cc",
     "requirements_checker_unittest.cc",
     "runtime_data_unittest.cc",
     "sandboxed_unpacker_unittest.cc",
     "updater/update_service_unittest.cc",
     "value_store/leveldb_scoped_database_unittest.cc",
     "value_store/leveldb_value_store_unittest.cc",
     "value_store/testing_value_store_unittest.cc",
@@ skipping 34 matching lines @@
     "//net:test_support",
     "//third_party/leveldatabase",
     "//third_party/zlib:zip",
   ]
 
   if (is_chromeos) {
     sources += [ "api/webcam_private/visca_webcam_unittest.cc" ]
     deps += [ "//chromeos:test_support" ]
   }
 }