Store unique_ptr instead of raw poiter in extension callback map

extensions/browser/extension_function_dispatcher.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_FUNCTION_DISPATCHER_H_
 #define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_DISPATCHER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 151 matching lines @@
 
   void RemoveWorkerCallbacksForProcess(int render_process_id);
 
   content::BrowserContext* browser_context_;
 
   Delegate* delegate_;
 
   // 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_;
 
   using UIThreadWorkerResponseCallbackWrapperMap =
       std::map<WorkerResponseCallbackMapKey,
                std::unique_ptr<UIThreadWorkerResponseCallbackWrapper>>;
   // TODO(lazyboy): The map entries are cleared upon RenderProcessHost shutown,
   // we should really be clearing it on service worker shutdown.
   UIThreadWorkerResponseCallbackWrapperMap
       ui_thread_response_callback_wrappers_for_worker_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_DISPATCHER_H_