Template methods on Timer classes instead of the classes themselves.

content/browser/tracing/background_tracing_manager_impl.h

 // Copyright 2015 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 CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_MANAGER_IMPL_H_
 
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 60 matching lines @@
     ~TracingTimer();
 
     void StartTimer(int seconds);
     void CancelTimer();
 
     void FireTimerForTesting();
 
    private:
     void TracingTimerFired();
 
-    base::OneShotTimer<TracingTimer> tracing_timer_;
+    base::OneShotTimer tracing_timer_;
     StartedFinalizingCallback callback_;
   };
 
   scoped_ptr<TracingDelegate> delegate_;
   scoped_ptr<const content::BackgroundTracingConfigImpl> config_;
   std::map<TriggerHandle, std::string> trigger_handles_;
   scoped_ptr<TracingTimer> tracing_timer_;
   ReceiveCallback receive_callback_;
 
   bool is_gathering_;
   bool is_tracing_;
   bool requires_anonymized_data_;
   int trigger_handle_ids_;
 
   TriggerHandle reactive_triggered_handle_;
 
   IdleCallback idle_callback_;
   base::Closure tracing_enabled_callback_for_testing_;
 
   friend struct base::DefaultLazyInstanceTraits<BackgroundTracingManagerImpl>;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundTracingManagerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_MANAGER_IMPL_H_