Add chrome/browser/apps/BUILD.gn and move Chrome-specific code there

apps/app_load_service_factory.cc

Index: apps/app_load_service_factory.cc
diff --git a/apps/app_load_service_factory.cc b/apps/app_load_service_factory.cc
deleted file mode 100644
index 3e0b54ae6d367f30b5ad88ddec7dd2163443c292..0000000000000000000000000000000000000000
--- a/apps/app_load_service_factory.cc
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2013 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.
-
-#include "apps/app_load_service_factory.h"
-
-#include "apps/app_load_service.h"
-#include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "content/public/browser/browser_context.h"
-#include "extensions/browser/app_window/app_window_registry.h"
-#include "extensions/browser/extension_prefs_factory.h"
-#include "extensions/browser/extension_registry_factory.h"
-#include "extensions/browser/extension_system_provider.h"
-#include "extensions/browser/extensions_browser_client.h"
-
-namespace apps {
-
-// static
-AppLoadService* AppLoadServiceFactory::GetForBrowserContext(
-    content::BrowserContext* context) {
-  return static_cast<AppLoadService*>(
-      GetInstance()->GetServiceForBrowserContext(context, true));
-}
-
-AppLoadServiceFactory* AppLoadServiceFactory::GetInstance() {
-  return base::Singleton<AppLoadServiceFactory>::get();
-}
-
-AppLoadServiceFactory::AppLoadServiceFactory()
-    : BrowserContextKeyedServiceFactory(
-        "AppLoadService",
-        BrowserContextDependencyManager::GetInstance()) {
-  DependsOn(extensions::AppWindowRegistry::Factory::GetInstance());
-  DependsOn(extensions::ExtensionPrefsFactory::GetInstance());
-  DependsOn(extensions::ExtensionRegistryFactory::GetInstance());
-  DependsOn(
-      extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
-}
-
-AppLoadServiceFactory::~AppLoadServiceFactory() {
-}
-
-KeyedService* AppLoadServiceFactory::BuildServiceInstanceFor(
-    content::BrowserContext* context) const {
-  return new AppLoadService(context);
-}
-
-bool AppLoadServiceFactory::ServiceIsNULLWhileTesting() const {
-  return false;
-}
-
-bool AppLoadServiceFactory::ServiceIsCreatedWithBrowserContext() const {
-  return true;
-}
-
-content::BrowserContext* AppLoadServiceFactory::GetBrowserContextToUse(
-    content::BrowserContext* context) const {
-  // Redirected in incognito.
-  return extensions::ExtensionsBrowserClient::Get()->
-      GetOriginalContext(context);
-}
-
-}  // namespace apps