Fix a possible crash in the ClientSideDetectionService.

chrome/browser/safe_browsing/client_side_detection_service.h

 // Copyright (c) 2011 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.
 //
 // Helper class which handles communication with the SafeBrowsing backends for
 // client-side phishing detection.  This class can be used to get a file
 // descriptor to the client-side phishing model and also to send a ping back to
 // Google to verify if a particular site is really phishing or not.
 //
 // This class is not thread-safe and expects all calls to GetModelFile() and
@@ skipping 147 matching lines @@
   void HandlePhishingVerdict(const URLFetcher* source,
                              const GURL& url,
                              const net::URLRequestStatus& status,
                              int response_code,
                              const ResponseCookies& cookies,
                              const std::string& data);
 
   FilePath model_path_;
   ModelStatus model_status_;
   base::PlatformFile model_file_;
-  URLFetcher* model_fetcher_;
+  scoped_ptr<URLFetcher> model_fetcher_;
   scoped_ptr<std::string> tmp_model_string_;
   std::vector<OpenModelDoneCallback*> open_callbacks_;
 
   // Map of client report phishing request to the corresponding callback that
   // has to be invoked when the request is done.
   struct ClientReportInfo;
   std::map<const URLFetcher*, ClientReportInfo*> client_phishing_reports_;
 
   // Used to asynchronously call the callbacks for GetModelFile and
   // SendClientReportPhishingRequest.
   ScopedRunnableMethodFactory<ClientSideDetectionService> method_factory_;
 
   // The client-side detection service object (this) might go away before some
   // of the callbacks are done (e.g., asynchronous file operations).  The
   // callback factory will revoke all pending callbacks if this goes away to
   // avoid a crash.
   base::ScopedCallbackFactory<ClientSideDetectionService> callback_factory_;
 
   // The context we use to issue network requests.
   scoped_refptr<URLRequestContextGetter> request_context_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSideDetectionService);
 };
 
 }  // namepsace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_CLIENT_SIDE_DETECTION_SERVICE_H_