Cleanup: Pass std::string as const reference if possible

net/dns/mdns_client_impl.h

Index: net/dns/mdns_client_impl.h
diff --git a/net/dns/mdns_client_impl.h b/net/dns/mdns_client_impl.h
index e788601fd76ec4e608aab43d523370e5f5be8a62..a9234c494a13cf1b686f2492e6184220c2b81460 100644
--- a/net/dns/mdns_client_impl.h
+++ b/net/dns/mdns_client_impl.h
@@ -122,7 +122,7 @@ class NET_EXPORT_PRIVATE MDnsClientImpl : public MDnsClient {
     bool Init(MDnsSocketFactory* socket_factory);
 
     // Send a query with a specific rrtype and name. Returns true on success.
-    bool SendQuery(uint16 rrtype, std::string name);
+    bool SendQuery(uint16 rrtype, const std::string& name);
 
     // Add/remove a listener to the list of listeners.
     void AddListener(MDnsListenerImpl* listener);