Use a const reference in IntentPickerResponse

chrome/browser/chromeos/arc/arc_navigation_throttle.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_navigation_throttle.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 230 matching lines @@
   }
 
   show_intent_picker_callback_.Run(
       navigation_handle()->GetWebContents(), app_info,
       base::Bind(&ArcNavigationThrottle::OnIntentPickerClosed,
                  weak_ptr_factory_.GetWeakPtr(), base::Passed(&handlers)));
 }
 
 void ArcNavigationThrottle::OnIntentPickerClosed(
     mojo::Array<mojom::IntentHandlerInfoPtr> handlers,
-    std::string selected_app_package,
+    const std::string& selected_app_package,
     CloseReason close_reason) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   const GURL& url = navigation_handle()->GetURL();
   content::NavigationHandle* handle = navigation_handle();
   previous_user_action_ = close_reason;
 
   // Make sure that the instance at least supports HandleUrl.
   auto* instance = ArcIntentHelperBridge::GetIntentHelperInstance(
       "HandleUrl", kMinVersionForHandleUrl);
   size_t selected_app_index = handlers.size();
@@ skipping 61 matching lines @@
 }
 
 // static
 bool ArcNavigationThrottle::ShouldOverrideUrlLoadingForTesting(
     const GURL& previous_url,
     const GURL& current_url) {
   return ShouldOverrideUrlLoading(previous_url, current_url);
 }
 
 }  // namespace arc