Change the API of disk_cache::CreateCacheBackend to use scoped_ptr

net/disk_cache/tracing_cache_backend.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 NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_
 #define NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_
 
 #include "base/memory/weak_ptr.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/stats.h"
 
 namespace disk_cache {
 
 class EntryProxy;
 
 // The TracingCacheBackend implements the Cache Backend interface. It intercepts
 // all backend operations from the IO thread and records the time from the start
 // of the operation until the result is delivered.
 class NET_EXPORT TracingCacheBackend : public Backend,
     public base::SupportsWeakPtr<TracingCacheBackend> {
  public:
-  explicit TracingCacheBackend(Backend* backend);
+  explicit TracingCacheBackend(scoped_ptr<Backend> backend);
 
   virtual net::CacheType GetCacheType() const OVERRIDE;
   virtual int32 GetEntryCount() const OVERRIDE;
   virtual int OpenEntry(const std::string& key, Entry** entry,
                         const CompletionCallback& callback) OVERRIDE;
   virtual int CreateEntry(const std::string& key, Entry** entry,
                           const CompletionCallback& callback) OVERRIDE;
   virtual int DoomEntry(const std::string& key,
                         const CompletionCallback& callback) OVERRIDE;
   virtual int DoomAllEntries(const CompletionCallback& callback) OVERRIDE;
@@ skipping 39 matching lines @@
   scoped_ptr<Backend> backend_;
   typedef std::map<Entry*, EntryProxy*> EntryToProxyMap;
   EntryToProxyMap open_entries_;
 
   DISALLOW_COPY_AND_ASSIGN(TracingCacheBackend);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_