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

chrome/browser/extensions/extension_idle_api.h

 // Copyright (c) 2011 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_EXTENSION_IDLE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_IDLE_API_H_
 #pragma once
 
 #include "chrome/browser/idle.h"
 #include "chrome/browser/extensions/extension_function.h"
 
 class Profile;
 
 // Event router class for events related to the idle API.
 class ExtensionIdleEventRouter {
  public:
   static void OnIdleStateChange(Profile* profile,
                                 IdleState idleState);
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionIdleEventRouter);
 };
 
 // Implementation of the chrome.idle.queryState API.
 class ExtensionIdleQueryStateFunction : public AsyncExtensionFunction {
  public:
+  DECLARE_EXTENSION_FUNCTION_NAME("idle.queryState")
+
+ protected:
+  virtual ~ExtensionIdleQueryStateFunction() {}
+
+  // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
-  DECLARE_EXTENSION_FUNCTION_NAME("idle.queryState")
 
  private:
   void IdleStateCallback(int threshold, IdleState state);
 };
 
 // Class used for caching answers from CalculateIdleState.
 class ExtensionIdleCache {
  public:
   static IdleState CalculateIdleState(int threshold);
   static void UpdateCache(int threshold, IdleState state);
@@ skipping 30 matching lines @@
   // |threshold| is threshold parameter of the query.
   // |state| is result of the query.
   // |moment| is moment in time this method is called.
   static void Update(int threshold, IdleState state, double moment);
 
   static int get_min_threshold();
   static double get_throttle_interval();
 
   static CacheData cached_data;
 };
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_IDLE_API_H_