Don't forget to free the callbacks!

webkit/glue/resource_fetcher.h

 // Copyright (c) 2006-2008 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.
 //
 // A wrapper around ResourceHandle and ResourceHandleClient that simplifies
 // the download of an HTTP object.  The interface is modeled after URLFetcher
 // in the /chrome/browser.
 //
 // ResourceFetcher::Delegate::OnURLFetchComplete will be called async after
 // the ResourceFetcher object is created.
@@ skipping 54 matching lines @@
   virtual void didFinishLoading(WebKit::WebURLLoader* loader);
   virtual void didFail(
       WebKit::WebURLLoader* loader, const WebKit::WebURLError& error);
 
   scoped_ptr<WebKit::WebURLLoader> loader_;
 
   // URL we're fetching
   GURL url_;
 
   // Callback when we're done
-  Callback* callback_;
+  scoped_ptr<Callback> callback_;
 
   // A copy of the original resource response
   WebKit::WebURLResponse response_;
 
   // Set to true once the request is compelte.
   bool completed_;
 
  private:
   // Start the actual download.
   void Start(WebFrame* frame);
@@ skipping 16 matching lines @@
   // kill the request.
   void TimeoutFired();
 
   // Limit how long we wait for the alternate error page server.
   base::OneShotTimer<ResourceFetcherWithTimeout> timeout_timer_;
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_RESOURCE_FETCHER_H_