First patch in making destructors of refcounted objects private.

base/directory_watcher.h

 // 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.
 
 // This module provides a way to monitor a directory for changes.
 
 #ifndef BASE_DIRECTORY_WATCHER_H_
 #define BASE_DIRECTORY_WATCHER_H_
 
 #include "base/basictypes.h"
@@ skipping 28 matching lines @@
   // is consistent on any particular version of Windows, but not across
   // different versions.
   bool Watch(const FilePath& path, Delegate* delegate,
              MessageLoop* backend_loop, bool recursive) {
     return impl_->Watch(path, delegate, backend_loop, recursive);
   }
 
   // Used internally to encapsulate different members on different platforms.
   class PlatformDelegate : public base::RefCounted<PlatformDelegate> {
    public:
-    virtual ~PlatformDelegate() {}
     virtual bool Watch(const FilePath& path, Delegate* delegate,
                        MessageLoop* backend_loop, bool recursive) = 0;
+
+   protected:
+    friend class base::RefCounted<PlatformDelegate>;
+
+    virtual ~PlatformDelegate() {}
   };
 
  private:
   scoped_refptr<PlatformDelegate> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryWatcher);
 };
 
 #endif  // BASE_DIRECTORY_WATCHER_H_