Use unique_ptr<DictionaryValue> in ProxyConfigDictionary

chromeos/network/onc/onc_translator_shill_to_onc.cc

Index: chromeos/network/onc/onc_translator_shill_to_onc.cc
diff --git a/chromeos/network/onc/onc_translator_shill_to_onc.cc b/chromeos/network/onc/onc_translator_shill_to_onc.cc
index ce403666456eb6d7667b58ac74806aa2528007cb..eacb2c3763fa6c645dedd9b5c206079c34521371 100644
--- a/chromeos/network/onc/onc_translator_shill_to_onc.cc
+++ b/chromeos/network/onc/onc_translator_shill_to_onc.cc
@@ -583,7 +583,7 @@ void ShillToONCTranslator::TranslateNetworkWithState() {
         ReadDictionaryFromJson(proxy_config_str));
     if (proxy_config_value) {
       std::unique_ptr<base::DictionaryValue> proxy_settings =
-          ConvertProxyConfigToOncProxySettings(*proxy_config_value);
+          ConvertProxyConfigToOncProxySettings(std::move(proxy_config_value));
       if (proxy_settings) {
         onc_object_->SetWithoutPathExpansion(
             ::onc::network_config::kProxySettings, proxy_settings.release());