Use PreloadCheckGroup in ExtensionInstallChecker. Make RequirementsChecker a PreloadCheck.

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 228 matching lines @@
       "process_manager_factory.h",
       "process_manager_observer.h",
       "process_map.cc",
       "process_map.h",
       "process_map_factory.cc",
       "process_map_factory.h",
       "quota_service.cc",
       "quota_service.h",
       "renderer_startup_helper.cc",
       "renderer_startup_helper.h",
+      "requirements_checker.cc",
       "requirements_checker.h",
       "runtime_data.cc",
       "runtime_data.h",
       "sandboxed_unpacker.cc",
       "sandboxed_unpacker.h",
       "script_execution_observer.h",
       "script_executor.cc",
       "script_executor.h",
       "serial_extension_host_queue.cc",
       "serial_extension_host_queue.h",
@@ skipping 231 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" ]
   }
 }