RefCounted types should not have public destructors, delegate cleanup

content/public/browser/profiler_subscriber.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_PROFILER_SUBSCRIBER_H_
 #define CONTENT_PUBLIC_BROWSER_PROFILER_SUBSCRIBER_H_
 
 #include "content/common/content_export.h"
 #include "content/public/common/process_type.h"
 
 namespace tracked_objects {
 struct ProcessDataSnapshot;
 }
 
 namespace content {
 
 // Objects interested in receiving profiler data derive from ProfilerSubscriber.
 class CONTENT_EXPORT ProfilerSubscriber {
  public:
-  virtual ~ProfilerSubscriber() {}
-
   // Send number of pending processes to subscriber. |end| is set to true if it
   // is the last time. This is called on the UI thread.
   virtual void OnPendingProcesses(int sequence_number,
                                   int pending_processes,
                                   bool end) = 0;
 
   // Send |profiler_data| back to subscriber.
   // This is called on the UI thread.
   virtual void OnProfilerDataCollected(
       int sequence_number,
       const tracked_objects::ProcessDataSnapshot& profiler_data,
       ProcessType process_type) = 0;
+
+ protected:
+  virtual ~ProfilerSubscriber() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PROFILER_SUBSCRIBER_H_