RefCounted types should not have public destructors

chrome/browser/extensions/api/idltest/idltest_api.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 CHROME_BROWSER_EXTENSIONS_API_IDLTEST_IDLTEST_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_IDLTEST_IDLTEST_API_H_
 #pragma once
 
 #include "chrome/browser/extensions/extension_function.h"
 
 class IdltestSendArrayBufferFunction : public SyncExtensionFunction {
  public:
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.idltest.sendArrayBuffer")
+
+ protected:
+  virtual ~IdltestSendArrayBufferFunction() {}
   virtual bool RunImpl() OVERRIDE;
- private:
-  DECLARE_EXTENSION_FUNCTION_NAME("experimental.idltest.sendArrayBuffer")
 };
 
 class IdltestSendArrayBufferViewFunction : public SyncExtensionFunction {
  public:
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.idltest.sendArrayBufferView")
+
+ protected:
+  virtual ~IdltestSendArrayBufferViewFunction() {}
   virtual bool RunImpl() OVERRIDE;
- private:
-  DECLARE_EXTENSION_FUNCTION_NAME("experimental.idltest.sendArrayBufferView")
 };
 
 class IdltestGetArrayBufferFunction : public SyncExtensionFunction {
  public:
+  DECLARE_EXTENSION_FUNCTION_NAME("experimental.idltest.getArrayBuffer")
+
+ protected:
+  virtual ~IdltestGetArrayBufferFunction() {}
   virtual bool RunImpl() OVERRIDE;
- private:
-  DECLARE_EXTENSION_FUNCTION_NAME("experimental.idltest.getArrayBuffer")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_IDLTEST_IDLTEST_API_H_