Change the API of disk_cache::CreateCacheBackend to use scoped_ptr

chrome/browser/nacl_host/pnacl_translation_cache.h

 // Copyright 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_NACL_HOST_PNACL_TRANSLATION_CACHE_H_
 #define CHROME_BROWSER_NACL_HOST_PNACL_TRANSLATION_CACHE_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 59 matching lines @@
 
   // Return the cache key for |info|
   static std::string GetKey(const nacl::PnaclCacheInfo& info);
 
  private:
   friend class PnaclTranslationCacheEntry;
   friend class PnaclTranslationCacheTest;
   // PnaclTranslationCacheEntry should only use the
   // OpComplete and backend methods on PnaclTranslationCache.
   void OpComplete(PnaclTranslationCacheEntry* entry);
-  disk_cache::Backend* backend() { return disk_cache_; }
+  disk_cache::Backend* backend() { return disk_cache_.get(); }
 
   int InitWithDiskBackend(const base::FilePath& disk_cache_dir,
                           int cache_size,
                           const CompletionCallback& callback);
 
   int InitWithMemBackend(int cache_size, const CompletionCallback& callback);
 
   int Init(net::CacheType,
            const base::FilePath& directory,
            int cache_size,
            const CompletionCallback& callback);
 
   void OnCreateBackendComplete(int rv);
 
-  disk_cache::Backend* disk_cache_;
+  scoped_ptr<disk_cache::Backend> disk_cache_;
   CompletionCallback init_callback_;
   bool in_memory_;
   std::map<void*, scoped_refptr<PnaclTranslationCacheEntry> > open_entries_;
 
   DISALLOW_COPY_AND_ASSIGN(PnaclTranslationCache);
 };
 
 }  // namespace pnacl
 
 #endif  // CHROME_BROWSER_NACL_HOST_PNACL_TRANSLATION_CACHE_H_