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

sync/tools/sync_client.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 <cstddef>
 #include <cstdio>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/base64.h"
@@ skipping 81 matching lines @@
     CHECK(base::Base64Encode(state, &base64_state));
     VLOG(1) << "Setting invalidation state to: " << base64_state;
   }
 };
 
 // Needed to use a real host resolver.
 class MyTestURLRequestContext : public TestURLRequestContext {
  public:
   MyTestURLRequestContext() : TestURLRequestContext(true) {
     context_storage_.set_host_resolver(
-        net::CreateSystemHostResolver(
-            net::HostResolver::kDefaultParallelism,
-            net::HostResolver::kDefaultRetryAttempts,
-            NULL));
+        net::HostResolver::CreateDefaultResolver(NULL).release());
     context_storage_.set_transport_security_state(
         new net::TransportSecurityState());
     Init();
   }
 
   virtual ~MyTestURLRequestContext() {}
 };
 
 class MyTestURLRequestContextGetter : public TestURLRequestContextGetter {
  public:
@@ skipping 271 matching lines @@
   io_thread.Stop();
   return 0;
 }
 
 }  // namespace
 }  // namespace syncer
 
 int main(int argc, char* argv[]) {
   return syncer::SyncClientMain(argc, argv);
 }