Re-write many calls to WrapUnique() with MakeUnique()

chromeos/network/onc/onc_translator_onc_to_shill.cc

Index: chromeos/network/onc/onc_translator_onc_to_shill.cc
diff --git a/chromeos/network/onc/onc_translator_onc_to_shill.cc b/chromeos/network/onc/onc_translator_onc_to_shill.cc
index 78f5f3feb7899d4ce156fb8479f559edf25ef7b1..606fe322bb78fdf8ffc9017228efe19a005b7c4c 100644
--- a/chromeos/network/onc/onc_translator_onc_to_shill.cc
+++ b/chromeos/network/onc/onc_translator_onc_to_shill.cc
@@ -36,7 +36,7 @@ std::unique_ptr<base::StringValue> ConvertValueToString(
   std::string str;
   if (!value.GetAsString(&str))
     base::JSONWriter::Write(value, &str);
-  return base::WrapUnique(new base::StringValue(str));
+  return base::MakeUnique<base::StringValue>(str);
 }
 
 // This class is responsible to translate the local fields of the given