GTTF: Add missing virtual destructors.

chrome/browser/extensions/extension_keybinding_registry.h

Index: chrome/browser/extensions/extension_keybinding_registry.h
diff --git a/chrome/browser/extensions/extension_keybinding_registry.h b/chrome/browser/extensions/extension_keybinding_registry.h
index 7acd7f53784c59cf1396507da80cb6d0c5369212..e0644afef3d27d8457f8cf0a9be4dadc5fd16c83 100644
--- a/chrome/browser/extensions/extension_keybinding_registry.h
+++ b/chrome/browser/extensions/extension_keybinding_registry.h
@@ -35,6 +35,9 @@ class ExtensionKeybindingRegistry : public content::NotificationObserver {
     // Gets the ActiveTabPermissionGranter for the active tab, if any.
     // If there is no active tab then returns NULL.
     virtual ActiveTabPermissionGranter* GetActiveTabPermissionGranter() = 0;
+
+   protected:
+    virtual ~Delegate() { }
   };
 
   // If |extension_filter| is not ALL_EXTENSIONS, only keybindings by