Revert "Fix a ton of compiler warnings."

chrome/common/worker_thread_ticker.h

Index: chrome/common/worker_thread_ticker.h
diff --git a/chrome/common/worker_thread_ticker.h b/chrome/common/worker_thread_ticker.h
index ceb29032c9aacf2cce974e2092cc8aa3fcdd1780..bbc5380c6117197aca51b045ae2630a158ef484e 100644
--- a/chrome/common/worker_thread_ticker.h
+++ b/chrome/common/worker_thread_ticker.h
@@ -1,9 +1,9 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2008 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_COMMON_WORKER_THREAD_TICKER_H_
-#define CHROME_COMMON_WORKER_THREAD_TICKER_H_
+#ifndef CHROME_COMMON_WORKER_THREAD_TICKER_H__
+#define CHROME_COMMON_WORKER_THREAD_TICKER_H__
 
 #include <vector>
 
@@ -24,9 +24,6 @@ class WorkerThreadTicker {
    public:
     // Gets invoked when the timer period is up
     virtual void OnTick() = 0;
-
-   protected:
-    ~Callback() {}
   };
 
   // tick_interval is the periodic interval in which to invoke the
@@ -87,4 +84,4 @@ class WorkerThreadTicker {
   DISALLOW_COPY_AND_ASSIGN(WorkerThreadTicker);
 };
 
-#endif  // CHROME_COMMON_WORKER_THREAD_TICKER_H_
+#endif  // CHROME_COMMON_WORKER_THREAD_TICKER_H__