Change the API of disk_cache::CreateCacheBackend to use scoped_ptr

net/disk_cache/mem_backend_impl.h

 // Copyright (c) 2012 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.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
 #ifndef NET_DISK_CACHE_MEM_BACKEND_IMPL_H__
 #define NET_DISK_CACHE_MEM_BACKEND_IMPL_H__
 
 #include "base/compiler_specific.h"
@@ skipping 14 matching lines @@
 class NET_EXPORT_PRIVATE MemBackendImpl : public Backend {
  public:
   explicit MemBackendImpl(net::NetLog* net_log);
   virtual ~MemBackendImpl();
 
   // Returns an instance of a Backend implemented only in memory. The returned
   // object should be deleted when not needed anymore. max_bytes is the maximum
   // size the cache can grow to. If zero is passed in as max_bytes, the cache
   // will determine the value to use based on the available memory. The returned
   // pointer can be NULL if a fatal error is found.
-  static Backend* CreateBackend(int max_bytes, net::NetLog* net_log);
+  static scoped_ptr<Backend> CreateBackend(int max_bytes, net::NetLog* net_log);
 
   // Performs general initialization for this current instance of the cache.
   bool Init();
 
   // Sets the maximum size for the total amount of data stored by this instance.
   bool SetMaxSize(int max_bytes);
 
   // Permanently deletes an entry.
   void InternalDoomEntry(MemEntryImpl* entry);
 
@@ skipping 65 matching lines @@
   int32 current_size_;
 
   net::NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(MemBackendImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_MEM_BACKEND_IMPL_H__