Template methods on Timer classes instead of the classes themselves.

chrome/browser/chromeos/idle_detector.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_IDLE_DETECTOR_H_
 #define CHROME_BROWSER_CHROMEOS_IDLE_DETECTOR_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
@@ skipping 10 matching lines @@
 
   void Start(const base::TimeDelta& timeout);
 
  private:
   // ui::UserActivityObserver overrides:
   void OnUserActivity(const ui::Event* event) override;
 
   // Resets |timer_| to fire when we reach our idle timeout.
   void ResetTimer();
 
-  base::OneShotTimer<IdleDetector> timer_;
+  base::OneShotTimer timer_;
 
   base::Closure idle_callback_;
 
   base::TimeDelta timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(IdleDetector);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_IDLE_DETECTOR_H_