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

chrome/browser/extensions/extension_idle_api.h

Index: chrome/browser/extensions/extension_idle_api.h
diff --git a/chrome/browser/extensions/extension_idle_api.h b/chrome/browser/extensions/extension_idle_api.h
index f34afc640ecc29b52220d9f38e08a0153fd02712..40f84789dcffbd066da521cc466729b4f7fd2b5a 100644
--- a/chrome/browser/extensions/extension_idle_api.h
+++ b/chrome/browser/extensions/extension_idle_api.h
@@ -23,9 +23,14 @@ class ExtensionIdleEventRouter {
 // Implementation of the chrome.idle.queryState API.
 class ExtensionIdleQueryStateFunction : public AsyncExtensionFunction {
  public:
-  virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("idle.queryState")
 
+ protected:
+  virtual ~ExtensionIdleQueryStateFunction() {}
+
+  // ExtensionFunction:
+  virtual bool RunImpl() OVERRIDE;
+
  private:
   void IdleStateCallback(int threshold, IdleState state);
 };
@@ -75,4 +80,5 @@ class ExtensionIdleCache {
 
   static CacheData cached_data;
 };
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_IDLE_API_H_