Use a const reference in IntentPickerResponse

chrome/browser/chromeos/arc/arc_external_protocol_dialog.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/arc/arc_external_protocol_dialog.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 52 matching lines @@
       tab_util::GetWebContentsByID(render_process_host_id, routing_id);
   if (web_contents && web_contents->GetController().IsInitialNavigation())
     web_contents->Close();
 }
 
 // Called when the dialog is closed.
 void OnIntentPickerClosed(int render_process_host_id,
                           int routing_id,
                           const GURL& url,
                           mojo::Array<mojom::IntentHandlerInfoPtr> handlers,
-                          std::string selected_app_package,
+                          const std::string& selected_app_package,
                           ArcNavigationThrottle::CloseReason close_reason) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   size_t selected_app_index = handlers.size();
   // Make sure that the instance at least supports HandleUrl.
   auto* instance = ArcIntentHelperBridge::GetIntentHelperInstance(
       "HandleUrl", kMinVersionForHandleUrl);
   if (!instance) {
     close_reason = ArcNavigationThrottle::CloseReason::ERROR;
   } else if (close_reason ==
@@ skipping 145 matching lines @@
 
   // Show ARC version of the dialog, which is IntentPickerBubbleView. To show
   // the bubble view, we need to ask ARC for a handler list first.
   instance->RequestUrlHandlerList(
       url.spec(),
       base::Bind(OnUrlHandlerList, render_process_host_id, routing_id, url));
   return true;
 }
 
 }  // namespace arc