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

chrome/browser/extensions/extension_system_impl.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_system_impl.h"
 
 #include <algorithm>
 
-#include "apps/app_restore_service.h"
-#include "apps/app_restore_service_factory.h"
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/trace_event/trace_event.h"
 #include "build/build_config.h"
+#include "chrome/browser/apps/browser_context_keyed_service_factories.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/chrome_app_sorting.h"
 #include "chrome/browser/extensions/chrome_content_verifier_delegate.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_error_reporter.h"
 #include "chrome/browser/extensions/extension_garbage_collector.h"
 #include "chrome/browser/extensions/extension_management.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_sync_service.h"
@@ skipping 298 matching lines @@
 
 ContentVerifier* ExtensionSystemImpl::Shared::content_verifier() {
   return content_verifier_.get();
 }
 
 void ExtensionSystemImpl::Shared::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_APP_TERMINATING, type);
-  CHECK(apps::AppRestoreServiceFactory::GetForBrowserContext(profile_));
-  apps::AppRestoreServiceFactory::GetForBrowserContext(profile_)
-      ->OnApplicationTerminating();
+  chrome_apps::NotifyApplicationTerminating(profile_);
 }
 
 //
 // ExtensionSystemImpl
 //
 
 ExtensionSystemImpl::ExtensionSystemImpl(Profile* profile)
     : profile_(profile) {
   shared_ = ExtensionSystemSharedFactory::GetForBrowserContext(profile);
 
@@ skipping 112 matching lines @@
 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const UnloadedExtensionInfo::Reason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&InfoMap::RemoveExtension, info_map(), extension_id, reason));
 }
 
 }  // namespace extensions