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

content/shell/shell_url_request_context_getter.cc

Index: content/shell/shell_url_request_context_getter.cc
diff --git a/content/shell/shell_url_request_context_getter.cc b/content/shell/shell_url_request_context_getter.cc
index 06af8f7c74bfe108de9292969b8995de2e1b1675..483e3f83b37334e818f964b590eaf31f03c95b5a 100644
--- a/content/shell/shell_url_request_context_getter.cc
+++ b/content/shell/shell_url_request_context_getter.cc
@@ -63,9 +63,7 @@ net::URLRequestContext* ShellURLRequestContextGetter::GetURLRequestContext() {
     url_request_context_->set_accept_charset("iso-8859-1,*,utf-8");
 
     storage_->set_host_resolver(
-        net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism,
-                                      net::HostResolver::kDefaultRetryAttempts,
-                                      NULL));
+        net::HostResolver::CreateDefaultResolver(NULL).release());
     storage_->set_cert_verifier(net::CertVerifier::CreateDefault());
     // TODO(jam): use v8 if possible, look at chrome code.
     storage_->set_proxy_service(