Add AffiliationFetcher to fetch authoritative affiliation information regarding facets.

components/password_manager/core/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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 config("password_manager_config") {
   # Sync (not supported in Android WebView).
   if (!is_android || !is_android_webview_build) {
     defines = [ "PASSWORD_MANAGER_ENABLE_SYNC" ]
   }
 }
 
 static_library("browser") {
   sources = [
+    "affiliation_fetcher_delegate.h",
+    "affiliation_fetcher.cc",
+    "affiliation_fetcher.h",
     "affiliation_utils.cc",
     "affiliation_utils.h",
     "browser_save_password_progress_logger.cc",
     "browser_save_password_progress_logger.h",
     "credential_manager_dispatcher.h",
     "log_receiver.h",
     "log_router.cc",
     "log_router.h",
     "login_database.cc",
     "login_database.h",
@@ skipping 84 matching lines @@
   public_deps = [
     ":browser",
   ]
   deps = [
     "//base",
     "//components/autofill/core/common",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }