Use mojo volume interfaces for mash and classic ash.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

 // Copyright (c) 2012 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_BROWSER_MAIN_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
 #include "chrome/browser/chromeos/external_metrics.h"
 #include "chromeos/system/version_loader.h"
 
 namespace session_manager {
 class SessionManager;
 }
 
 namespace arc {
 class ArcServiceLauncher;
 }
 
 namespace chromeos {
 
 class DataPromoNotification;
 class EventRewriter;
 class EventRewriterController;
+class ExtensionSystemEventObserver;
 class IdleActionWarningObserver;
 class LoginLockStateNotifier;
 class LowDiskNotification;
 class MagnificationManager;
 class PeripheralBatteryObserver;
 class PowerPrefs;
 class RendererFreezer;
 class SessionManagerObserver;
 class SwapMetrics;
 class WakeOnWifiManager;
@@ skipping 22 matching lines @@
   void PreProfileInit() override;
   void PostProfileInit() override;
   void PreBrowserStart() override;
   void PostBrowserStart() override;
 
   void PostMainMessageLoopRun() override;
   void PostDestroyThreads() override;
 
  private:
   std::unique_ptr<default_app_order::ExternalLoader> app_order_loader_;
+  std::unique_ptr<ExtensionSystemEventObserver>
+      extension_system_event_observer_;
   std::unique_ptr<PeripheralBatteryObserver> peripheral_battery_observer_;
   std::unique_ptr<PowerPrefs> power_prefs_;
   std::unique_ptr<LoginLockStateNotifier> login_lock_state_notifier_;
   std::unique_ptr<IdleActionWarningObserver> idle_action_warning_observer_;
   std::unique_ptr<DataPromoNotification> data_promo_notification_;
   std::unique_ptr<RendererFreezer> renderer_freezer_;
   std::unique_ptr<WakeOnWifiManager> wake_on_wifi_manager_;
 
   std::unique_ptr<internal::DBusServices> dbus_services_;
 
   std::unique_ptr<session_manager::SessionManager> session_manager_;
 
   std::unique_ptr<EventRewriterController> keyboard_event_rewriters_;
 
   scoped_refptr<chromeos::ExternalMetrics> external_metrics_;
 
   std::unique_ptr<arc::ArcServiceLauncher> arc_service_launcher_;
 
   std::unique_ptr<LowDiskNotification> low_disk_notification_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_