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

net/base/mapped_host_resolver.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/base/mapped_host_resolver.h"
 
 #include "base/string_tokenizer.h"
 #include "base/string_util.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_util.h"
 
 namespace net {
 
-MappedHostResolver::MappedHostResolver(HostResolver* impl)
-    : impl_(impl) {
+MappedHostResolver::MappedHostResolver(scoped_ptr<HostResolver> impl)
+    : impl_(impl.Pass()) {
 }
 
 MappedHostResolver::~MappedHostResolver() {
 }
 
 int MappedHostResolver::Resolve(const RequestInfo& info,
                                 AddressList* addresses,
                                 const CompletionCallback& callback,
                                 RequestHandle* out_req,
                                 const BoundNetLog& net_log) {
@@ skipping 22 matching lines @@
 HostResolver::RequestInfo MappedHostResolver::ApplyRules(
     const RequestInfo& info) const {
   RequestInfo modified_info = info;
   HostPortPair host_port(info.host_port_pair());
   if (rules_.RewriteHost(&host_port))
     modified_info.set_host_port_pair(host_port);
   return modified_info;
 }
 
 }  // namespace net