Validate hash_sha256 checksum on .crx update.

chrome/browser/chromeos/extensions/external_cache.h

 // Copyright (c) 2013 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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 77 matching lines @@
   // Implementation of ExtensionDownloaderDelegate:
   virtual void OnExtensionDownloadFailed(
       const std::string& id,
       Error error,
       const PingResult& ping_result,
       const std::set<int>& request_ids) override;
 
   virtual void OnExtensionDownloadFinished(
       const std::string& id,
       const base::FilePath& path,
+      const std::string& hash,
       bool file_ownership_passed,
       const GURL& download_url,
       const std::string& version,
       const PingResult& ping_result,
       const std::set<int>& request_ids) override;
 
   virtual bool IsExtensionPending(const std::string& id) override;
 
   virtual bool GetExtensionExistingVersion(const std::string& id,
                                            std::string* version) override;
@@ skipping 81 matching lines @@
 
   // Weak factory for callbacks.
   base::WeakPtrFactory<ExternalCache> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalCache);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_EXTERNAL_CACHE_H_