Revert "Fix a ton of compiler warnings."

base/waitable_event.h

-// 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 BASE_WAITABLE_EVENT_H_
 #define BASE_WAITABLE_EVENT_H_
 
 #include "base/basictypes.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 102 matching lines @@
     // Because of this, a Waiter may "reject" a wake by returning false. In
     // this case, the auto-reset WaitableEvent shouldn't act as if anything has
     // been notified.
     virtual bool Fire(WaitableEvent* signaling_event) = 0;
 
     // Waiters may implement this in order to provide an extra condition for
     // two Waiters to be considered equal. In WaitableEvent::Dequeue, if the
     // 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:
   friend class WaitableEventWatcher;
 
 #if defined(OS_WIN)
   HANDLE handle_;
 #else
   // On Windows, one can close a HANDLE which is currently being waited on. The
   // MSDN documentation says that the resulting behaviour is 'undefined', but
@@ skipping 34 matching lines @@
   static size_t EnqueueMany(WaiterAndIndex* waitables,
                             size_t count, Waiter* waiter);
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(WaitableEvent);
 };
 
 }  // namespace base
 
 #endif  // BASE_WAITABLE_EVENT_H_