Refactor Timer classes in preparation for landing FrameTimers.

third_party/WebKit/Source/core/loader/PingLoader.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 74 matching lines @@
     static void start(LocalFrame*, ResourceRequest&, const FetchInitiatorInfo&, StoredCredentials = AllowStoredCredentials);
 
     void dispose();
 
 private:
     void didReceiveResponse(WebURLLoader*, const WebURLResponse&) final;
     void didReceiveData(WebURLLoader*, const char*, int, int, int) final;
     void didFinishLoading(WebURLLoader*, double, int64_t) final;
     void didFail(WebURLLoader*, const WebURLError&) final;
 
-    void timeout(Timer<PingLoader>*);
+    void timeout(TimerBase*);
 
     void didFailLoading(LocalFrame*);
 
     std::unique_ptr<WebURLLoader> m_loader;
     Timer<PingLoader> m_timeout;
     String m_url;
     unsigned long m_identifier;
     SelfKeepAlive<PingLoader> m_keepAlive;
 };
 
 } // namespace blink
 
 #endif // PingLoader_h