Template methods on Timer classes instead of the classes themselves.

chrome/browser/apps/ephemeral_app_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_
 #define CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_
 
 #include <set>
 
 #include "apps/app_lifetime_monitor.h"
@@ skipping 75 matching lines @@
                               std::set<std::string>* remove_app_ids);
 
   Profile* profile_;
 
   ScopedObserver<extensions::ExtensionRegistry,
                  extensions::ExtensionRegistryObserver>
       extension_registry_observer_;
   ScopedObserver<apps::AppLifetimeMonitor, apps::AppLifetimeMonitor::Observer>
       app_lifetime_monitor_observer_;
 
-  base::OneShotTimer<EphemeralAppService> garbage_collect_apps_timer_;
+  base::OneShotTimer garbage_collect_apps_timer_;
 
   // The count of cached ephemeral apps.
   int ephemeral_app_count_;
 
   // Number of seconds before disabling idle ephemeral apps.
   // Overridden in tests.
   int disable_idle_app_delay_;
 
   base::WeakPtrFactory<EphemeralAppService> weak_ptr_factory_;
 
   friend class EphemeralAppServiceTest;
   friend class EphemeralAppServiceBrowserTest;
 
   DISALLOW_COPY_AND_ASSIGN(EphemeralAppService);
 };
 
 #endif  // CHROME_BROWSER_APPS_EPHEMERAL_APP_SERVICE_H_