[net] Change factory methods for HostResolver and HostCache to return a scoped_ptr

net/url_request/url_request_context_storage.cc

 // 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.
 
 #include "net/url_request/url_request_context_storage.h"
 
 #include "base/logging.h"
 #include "net/base/cert_verifier.h"
 #include "net/base/host_resolver.h"
 #include "net/base/net_log.h"
@@ skipping 17 matching lines @@
   DCHECK(context);
 }
 
 URLRequestContextStorage::~URLRequestContextStorage() {}
 
 void URLRequestContextStorage::set_net_log(NetLog* net_log) {
   context_->set_net_log(net_log);
   net_log_.reset(net_log);
 }
 
-void URLRequestContextStorage::set_host_resolver(HostResolver* host_resolver) {
-  context_->set_host_resolver(host_resolver);
-  host_resolver_.reset(host_resolver);
+void URLRequestContextStorage::set_host_resolver(
+    scoped_ptr<HostResolver> host_resolver) {
+  context_->set_host_resolver(host_resolver.get());
+  host_resolver_ = host_resolver.Pass();
 }
 
 void URLRequestContextStorage::set_cert_verifier(CertVerifier* cert_verifier) {
   context_->set_cert_verifier(cert_verifier);
   cert_verifier_.reset(cert_verifier);
 }
 
 void URLRequestContextStorage::set_server_bound_cert_service(
     ServerBoundCertService* server_bound_cert_service) {
   context_->set_server_bound_cert_service(server_bound_cert_service);
@@ skipping 65 matching lines @@
   job_factory_.reset(job_factory);
 }
 
 void URLRequestContextStorage::set_throttler_manager(
     URLRequestThrottlerManager* throttler_manager) {
   context_->set_throttler_manager(throttler_manager);
   throttler_manager_.reset(throttler_manager);
 }
 
 }  // namespace net