Template methods on Timer classes instead of the classes themselves.

chrome/browser/extensions/api/audio_modem/audio_modem_api.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 CHROME_BROWSER_EXTENSIONS_API_AUDIO_MODEM_AUDIO_MODEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_AUDIO_MODEM_AUDIO_MODEM_API_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 55 matching lines @@
 
   content::BrowserContext* const browser_context_;
   scoped_ptr<audio_modem::WhispernetClient> whispernet_client_;
   scoped_ptr<audio_modem::Modem> modem_;
   bool init_failed_;
 
   // IDs for the currently transmitting app (if any), indexed by AudioType.
   std::string transmitters_[2];
 
   // Timeouts for the currently active transmits, indexed by AudioType.
-  base::OneShotTimer<AudioModemAPI> transmit_timers_[2];
+  base::OneShotTimer transmit_timers_[2];
 
   // Maps of currently receiving app ID => timeouts. Indexed by AudioType.
   // We own all of these pointers. Do not remove them without calling delete.
-  std::map<std::string, base::OneShotTimer<AudioModemAPI>*> receive_timers_[2];
+  std::map<std::string, base::OneShotTimer*> receive_timers_[2];
 
   // BrowserContextKeyedAPI implementation.
   static const bool kServiceIsCreatedWithBrowserContext = false;
   static const char* service_name() { return "AudioModemAPI"; }
 
   DISALLOW_COPY_AND_ASSIGN(AudioModemAPI);
 };
 
 template<>
 void BrowserContextKeyedAPIFactory<AudioModemAPI>::DeclareFactoryDependencies();
@@ skipping 31 matching lines @@
   DECLARE_EXTENSION_FUNCTION("audioModem.stopReceive", AUDIOMODEM_STOPRECEIVE);
 
  protected:
   ~AudioModemStopReceiveFunction() override {}
   ExtensionFunction::ResponseAction Run() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_AUDIO_MODEM_AUDIO_MODEM_API_H_