Template methods on Timer classes instead of the classes themselves.

chrome/browser/upgrade_detector_impl.h

 // Copyright (c) 2011 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_UPGRADE_DETECTOR_IMPL_H_
 #define CHROME_BROWSER_UPGRADE_DETECTOR_IMPL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "base/version.h"
@@ skipping 56 matching lines @@
   // Called on the FILE thread to detect an upgrade. Calls back UpgradeDetected
   // on the UI thread if so. Although it looks weird, this needs to be a static
   // method receiving a WeakPtr<> to this object so that we can interrupt
   // the UpgradeDetected callback before it runs. Having this method non-static
   // and using |this| directly wouldn't be thread safe. And keeping it as a
   // non-class function would prevent it from calling UpgradeDetected.
   static void DetectUpgradeTask(
       base::WeakPtr<UpgradeDetectorImpl> upgrade_detector);
 
   // We periodically check to see if Chrome has been upgraded.
-  base::RepeatingTimer<UpgradeDetectorImpl> detect_upgrade_timer_;
+  base::RepeatingTimer detect_upgrade_timer_;
 
   // After we detect an upgrade we start a recurring timer to see if enough time
   // has passed and we should start notifying the user.
-  base::RepeatingTimer<UpgradeDetectorImpl> upgrade_notification_timer_;
+  base::RepeatingTimer upgrade_notification_timer_;
 
   // True if this build is a dev or canary channel build.
   bool is_unstable_channel_;
 
   // True if auto update is turned on.
   bool is_auto_update_enabled_;
 
   // When the upgrade was detected - either a software update or a variations
   // update, whichever happened first.
   base::TimeTicks upgrade_detected_time_;
 
   // The date the binaries were built.
   base::Time build_date_;
 
   // We use this factory to create callback tasks for UpgradeDetected. We pass
   // the task to the actual upgrade detection code, which is in
   // DetectUpgradeTask.
   base::WeakPtrFactory<UpgradeDetectorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UpgradeDetectorImpl);
 };
 
 
 #endif  // CHROME_BROWSER_UPGRADE_DETECTOR_IMPL_H_