Template methods on Timer classes instead of the classes themselves.

components/history/core/browser/top_sites_impl.h

 // Copyright (c) 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 COMPONENTS_HISTORY_CORE_BROWSER_TOP_SITES_IMPL_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_TOP_SITES_IMPL_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 253 matching lines @@
   scoped_ptr<TopSitesCache> thread_safe_cache_;
 
   // Lock used to access |thread_safe_cache_|.
   mutable base::Lock lock_;
 
   // Task tracker for history and backend requests.
   base::CancelableTaskTracker cancelable_task_tracker_;
 
   // Timer that asks history for the top sites. This is used to make sure our
   // data stays in sync with history.
-  base::OneShotTimer<TopSitesImpl> timer_;
+  base::OneShotTimer timer_;
 
   // The time we started |timer_| at. Only valid if |timer_| is running.
   base::TimeTicks timer_start_time_;
 
   // The number of URLs changed on the last update.
   size_t last_num_urls_changed_;
 
   // The pending requests for the top sites list. Can only be non-empty at
   // startup. After we read the top sites from the DB, we'll always have a
   // cached list and be able to run callbacks immediately.
@@ skipping 28 matching lines @@
 
   ScopedObserver<HistoryService, HistoryServiceObserver>
       history_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(TopSitesImpl);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_TOP_SITES_IMPL_H_