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

net/base/host_resolver_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.
 
 #ifndef NET_BASE_HOST_RESOLVER_IMPL_H_
 #define NET_BASE_HOST_RESOLVER_IMPL_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 97 matching lines @@
   // run at once. This upper-bounds the total number of outstanding
   // DNS transactions (not counting retransmissions and retries).
   //
   // |dns_config_service| will be used to detect changes to DNS configuration
   // and obtain DnsConfig for DnsClient.
   //
   // |dns_client|, if set, will be used to resolve requests.
   //
   // |net_log| must remain valid for the life of the HostResolverImpl.
   // TODO(szym): change to scoped_ptr<HostCache>.
-  HostResolverImpl(HostCache* cache,
+  HostResolverImpl(scoped_ptr<HostCache> cache,
                    const PrioritizedDispatcher::Limits& job_limits,
                    const ProcTaskParams& proc_params,
                    scoped_ptr<DnsClient> dns_client,
                    NetLog* net_log);
 
   // If any completion callbacks are pending when the resolver is destroyed,
   // the host resolutions are cancelled, and the completion callbacks will not
   // be called.
   virtual ~HostResolverImpl();
 
@@ skipping 137 matching lines @@
   HostResolverFlags additional_resolver_flags_;
 
   NetLog* net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(HostResolverImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_IMPL_H_