Revert "Fix a ton of compiler warnings."

base/waitable_event.h

Index: base/waitable_event.h
diff --git a/base/waitable_event.h b/base/waitable_event.h
index 2b498497457134260c69b0e5742e2265852b5a5e..31aa085df40201adc102910e3929664fd5eeb98b 100644
--- a/base/waitable_event.h
+++ b/base/waitable_event.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -121,9 +121,6 @@ class WaitableEvent {
     // pointers match then this function is called as a final check. See the
     // comments in ~Handle for why.
     virtual bool Compare(void* tag) = 0;
-
-   protected:
-    ~Waiter() {}
   };
 
  private: