Revert "Fix a ton of compiler warnings."

base/system_monitor.h

Index: base/system_monitor.h
diff --git a/base/system_monitor.h b/base/system_monitor.h
index 6322be95211582bdf1e0b9522d27f92d209a06f6..aeec42b788c4913d3a55a49f58ebd1457615e299 100644
--- a/base/system_monitor.h
+++ b/base/system_monitor.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 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.
 
@@ -72,9 +72,6 @@ class SystemMonitor {
 
     // Notification that the system is resuming.
     virtual void OnResume(SystemMonitor*) = 0;
-
-   protected:
-    ~PowerObserver() {}
   };
 
   // Add a new observer.