Printing fixups for scoped_refptr operator T* removal.

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index d3489619df5a07d5b47a0cdf8603268f853f548b..a1d22f1203d7250aac2f3c1a280d17d95dfb2457 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -1363,13 +1363,14 @@ bool PrintPreviewHandler::GetPreviewDataAndTitle(
 
 #if defined(ENABLE_SERVICE_DISCOVERY)
 
-void PrintPreviewHandler::StartPrivetLister(
-    scoped_refptr<local_discovery::ServiceDiscoverySharedClient> client) {
+void PrintPreviewHandler::StartPrivetLister(const scoped_refptr<
+    local_discovery::ServiceDiscoverySharedClient>& client) {
   if (!PrivetPrintingEnabled())
     return web_ui()->CallJavascriptFunction("onPrivetPrinterSearchDone");
 
   Profile* profile = Profile::FromWebUI(web_ui());
-  DCHECK(!service_discovery_client_ || service_discovery_client_ == client);
+  DCHECK(!service_discovery_client_.get() ||
+         service_discovery_client_ == client);
   service_discovery_client_ = client;
   printer_lister_.reset(new local_discovery::PrivetLocalPrinterLister(
       service_discovery_client_.get(), profile->GetRequestContext(), this));