[iOS] Re-add call to prepare keyed service factories

This used to be in our custom startup logic, but with that gone we can just place it in the chromium_src override we already have

chromium_src/ios/chrome/browser/browser_state/model/BUILD.gn

@@ -0,0 +1,8 @@
+# Copyright (c) 2023 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at https://mozilla.org/MPL/2.0/.
+
+group("model") {
+  deps = [ "//brave/ios/browser/browser_state" ]
+}

chromium_src/ios/chrome/browser/browser_state/model/DEPS

@@ -0,0 +1,3 @@
+include_rules = [
+  "+brave/ios/browser/browser_state"
+]

chromium_src/ios/chrome/browser/browser_state/model/browser_state_keyed_service_factories.mm

@@ -5,6 +5,7 @@
 
 #include "ios/chrome/browser/browser_state/model/browser_state_keyed_service_factories.h"
 
+#include "brave/ios/browser/browser_state/brave_browser_state_keyed_service_factories.h"
 #include "ios/chrome/browser/autofill/personal_data_manager_factory.h"
 #include "ios/chrome/browser/bookmarks/model/bookmark_undo_service_factory.h"
 #include "ios/chrome/browser/bookmarks/model/local_or_syncable_bookmark_model_factory.h"
@@ -53,4 +54,6 @@ void EnsureBrowserStateKeyedServiceFactoriesBuilt() {
   ReadingListModelFactory::GetInstance();
   SessionSyncServiceFactory::GetInstance();
   SyncSetupServiceFactory::GetInstance();
+
+  brave::EnsureBrowserStateKeyedServiceFactoriesBuilt();
 }