Template methods on Timer classes instead of the classes themselves.

components/copresence/timed_map.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 COMPONENTS_COPRESENCE_TIMED_MAP_H_
 #define COMPONENTS_COPRESENCE_TIMED_MAP_H_
 
 #include <map>
 #include <queue>
 #include <utility>
@@ skipping 78 matching lines @@
       return left.second > right.second;
     }
   };
 
   using ExpiryQueue = std::priority_queue<
       KeyTimeTuple, std::vector<KeyTimeTuple>, EarliestFirstComparator>;
 
   const ValueType kEmptyValue;
 
   scoped_ptr<base::TickClock> clock_;
-  base::RepeatingTimer<TimedMap> timer_;
+  base::RepeatingTimer timer_;
   const base::TimeDelta lifetime_;
   const size_t max_elements_;
   std::map<KeyType, ValueType> map_;
   // Priority queue with our element keys ordered by the earliest expiring keys
   // first.
   ExpiryQueue expiry_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(TimedMap);
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_TIMED_MAP_H_