RefCounted types should not have public destructors, chrome/browser/extensions

chrome/browser/extensions/system/system_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.
 
 // This extension API contains system-wide preferences and functions that shall
 // be only available to component extensions.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_SYSTEM_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_SYSTEM_SYSTEM_API_H_
 
 #include "chrome/browser/extensions/extension_function.h"
 
 namespace extensions {
 
 class GetIncognitoModeAvailabilityFunction : public SyncExtensionFunction {
  public:
+  DECLARE_EXTENSION_FUNCTION_NAME("systemPrivate.getIncognitoModeAvailability")
+
+ protected:
   virtual ~GetIncognitoModeAvailabilityFunction() {}
+
+  // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
-  DECLARE_EXTENSION_FUNCTION_NAME("systemPrivate.getIncognitoModeAvailability")
 };
 
 // API function which returns the status of system update.
 class GetUpdateStatusFunction : public SyncExtensionFunction {
  public:
+  DECLARE_EXTENSION_FUNCTION_NAME("systemPrivate.getUpdateStatus")
+
+ protected:
   virtual ~GetUpdateStatusFunction() {}
+
+  // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
-  DECLARE_EXTENSION_FUNCTION_NAME("systemPrivate.getUpdateStatus")
 };
 
 void DispatchBrightnessChangedEvent(int brightness, bool user_initiated);
 void DispatchVolumeChangedEvent(double volume, bool is_volume_muted);
 void DispatchScreenUnlockedEvent();
 void DispatchWokeUpEvent();
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SYSTEM_SYSTEM_API_H_