Make browser process a singleton service

chrome/browser/chromeos/chrome_interface_factory.h

-// Copyright 2016 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_CHROME_INTERFACE_FACTORY_H_
-#define CHROME_BROWSER_CHROMEOS_CHROME_INTERFACE_FACTORY_H_
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
-#include "content/public/common/connection_filter.h"
-
-namespace chromeos {
-
-// InterfaceFactory for creating all services provided by chrome. Lives on the
-// IO thread.
-class ChromeInterfaceFactory : public content::ConnectionFilter {
- public:
-  ChromeInterfaceFactory();
-  ~ChromeInterfaceFactory() override;
-
- private:
-  // content::ConnectionFilter:
-  bool OnConnect(const service_manager::Identity& remote_identity,
-                 service_manager::InterfaceRegistry* registry,
-                 service_manager::Connector* connector) override;
-
-  scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChromeInterfaceFactory);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_CHROME_INTERFACE_FACTORY_H_