Store unique_ptr instead of raw poiter in extension callback map

extensions/browser/extension_function_dispatcher.h

Index: extensions/browser/extension_function_dispatcher.h
diff --git a/extensions/browser/extension_function_dispatcher.h b/extensions/browser/extension_function_dispatcher.h
index 073ca0e6e6adb90d72f37bd145d93be4535149fd..c7b1d8f155408b5afd26e8feb5ae567014fb5eaf 100644
--- a/extensions/browser/extension_function_dispatcher.h
+++ b/extensions/browser/extension_function_dispatcher.h
@@ -169,7 +169,8 @@ class ExtensionFunctionDispatcher
   // This map doesn't own either the keys or the values. When a RenderFrameHost
   // instance goes away, the corresponding entry in this map (if exists) will be
   // removed.
-  typedef std::map<content::RenderFrameHost*, UIThreadResponseCallbackWrapper*>
+  typedef std::map<content::RenderFrameHost*,
+                   std::unique_ptr<UIThreadResponseCallbackWrapper>>
       UIThreadResponseCallbackWrapperMap;
   UIThreadResponseCallbackWrapperMap ui_thread_response_callback_wrappers_;