RefCounted types should not have public destructors, delegate cleanup

chrome/browser/extensions/webstore_installer.h

Index: chrome/browser/extensions/webstore_installer.h
diff --git a/chrome/browser/extensions/webstore_installer.h b/chrome/browser/extensions/webstore_installer.h
index bea6d6d692b7c33955c78c8dc6715ddbc330dd9d..4312447948f73469463f7410f6d90d91831ec317 100644
--- a/chrome/browser/extensions/webstore_installer.h
+++ b/chrome/browser/extensions/webstore_installer.h
@@ -45,6 +45,9 @@ class WebstoreInstaller : public content::NotificationObserver,
     virtual void OnExtensionInstallSuccess(const std::string& id) = 0;
     virtual void OnExtensionInstallFailure(const std::string& id,
                                            const std::string& error) = 0;
+
+   protected:
+    virtual ~Delegate() {}
   };
 
   // Contains information about what parts of the extension install process can