Change NetLog::ParametersCallback to return a scoped_ptr.

net/dns/dns_config_service.cc

Index: net/dns/dns_config_service.cc
diff --git a/net/dns/dns_config_service.cc b/net/dns/dns_config_service.cc
index bfa4b8db84e648393eecfd4ce8a4d82ff6afcce7..38b61ffce9bc581a2608ca50ba96036f866bb5ee 100644
--- a/net/dns/dns_config_service.cc
+++ b/net/dns/dns_config_service.cc
@@ -139,7 +139,7 @@ void DnsConfig::CopyIgnoreHosts(const DnsConfig& d) {
 }
 
 base::Value* DnsConfig::ToValue() const {
-  base::DictionaryValue* dict = new base::DictionaryValue();
+  scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
 
   base::ListValue* list = new base::ListValue();
   for (size_t i = 0; i < nameservers.size(); ++i)
@@ -161,10 +161,9 @@ base::Value* DnsConfig::ToValue() const {
   dict->SetBoolean("use_local_ipv6", use_local_ipv6);
   dict->SetInteger("num_hosts", hosts.size());
 
-  return dict;
+  return dict.release();
 }
 
-
 DnsConfigService::DnsConfigService()
     : watch_failed_(false),
       have_config_(false),