Change the API of disk_cache::CreateCacheBackend to use scoped_ptr

net/disk_cache/tracing_cache_backend.cc

 // 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.
 
 #include "net/disk_cache/tracing_cache_backend.h"
 
 #include "net/base/net_errors.h"
 
 namespace disk_cache {
 
@@ skipping 158 matching lines @@
     cb.Run(result);
   }
 }
 
 EntryProxy::~EntryProxy() {
   if (backend_.get()) {
     backend_->OnDeleteEntry(entry_);
   }
 }
 
-TracingCacheBackend::TracingCacheBackend(Backend* backend)
-  : backend_(backend) {
+TracingCacheBackend::TracingCacheBackend(scoped_ptr<Backend> backend)
+  : backend_(backend.Pass()) {
 }
 
 TracingCacheBackend::~TracingCacheBackend() {
 }
 
 net::CacheType TracingCacheBackend::GetCacheType() const {
   return backend_->GetCacheType();
 }
 
 int32 TracingCacheBackend::GetEntryCount() const {
@@ skipping 117 matching lines @@
 
 void TracingCacheBackend::GetStats(StatsItems* stats) {
   return backend_->GetStats(stats);
 }
 
 void TracingCacheBackend::OnExternalCacheHit(const std::string& key) {
   return backend_->OnExternalCacheHit(key);
 }
 
 }  // namespace disk_cache