Convert JsonWriter::Write to taking a const ref for the in-param

net/http/transport_security_persister.cc

Index: net/http/transport_security_persister.cc
diff --git a/net/http/transport_security_persister.cc b/net/http/transport_security_persister.cc
index 08aa07e1c9112ae1d8046dfb59f3303d4240aea9..22422009dde5e50e9dbb8dd145518051c8b90606 100644
--- a/net/http/transport_security_persister.cc
+++ b/net/http/transport_security_persister.cc
@@ -171,9 +171,8 @@ bool TransportSecurityPersister::SerializeData(std::string* output) {
     toplevel.Set(HashedDomainToExternalString(hostname), serialized);
   }
 
-  base::JSONWriter::WriteWithOptions(&toplevel,
-                                     base::JSONWriter::OPTIONS_PRETTY_PRINT,
-                                     output);
+  base::JSONWriter::WriteWithOptions(
+      toplevel, base::JSONWriter::OPTIONS_PRETTY_PRINT, output);
   return true;
 }