Template methods on Timer classes instead of the classes themselves.

chrome/browser/chromeos/login/screenshot_testing/screenshot_testing_mixin.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_LOGIN_SCREENSHOT_TESTING_SCREENSHOT_TESTING_MIXIN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SCREENSHOT_TESTING_MIXIN_H_
 
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 32 matching lines @@
   // This method should be used after getting all the necessary notifications
   // to wait for the actual load of animation.
   void SynchronizeAnimationLoadWithCompositor();
 
   // This method exists only because of the current implementation of
   // SynchronizeAnimationLoadWithCompositor.
   void HandleAnimationLoad();
 
   // Required for current implementation of
   // SynchronizeAnimationLoadWithCompositor()
-  base::OneShotTimer<ScreenshotTestingMixin> timer_;
+  base::OneShotTimer timer_;
   base::Closure animation_waiter_quitter_;
 
   // Is true if testing with screenshots is turned on with all proper switches.
   bool enable_test_screenshots_;
 
   // |screenshot_tester_ | does everything connected with taking, loading and
   // comparing screenshots
   ScreenshotTester screenshot_tester_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTING_SCREENSHOT_TESTING_MIXIN_H_