Use a const reference in IntentPickerResponse

chrome/browser/ui/browser_dialogs.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 #define CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 162 matching lines @@
 }  // namespace chrome
 
 #if defined(OS_CHROMEOS)
 
 // This callback informs the package name of the app selected by the user, along
 // with the reason why the Bubble was closed. The string param must have a valid
 // package name, except when the CloseReason is ERROR or DIALOG_DEACTIVATED, for
 // these cases we return a dummy value which won't be used at all and has no
 // significance.
 using IntentPickerResponse =
-    base::Callback<void(std::string, arc::ArcNavigationThrottle::CloseReason)>;
+    base::Callback<void(const std::string&,
+                        arc::ArcNavigationThrottle::CloseReason)>;
 
 // Return a pointer to the IntentPickerBubbleView::ShowBubble method.
 using BubbleShowPtr =
     void (*)(content::WebContents*,
              const std::vector<arc::ArcNavigationThrottle::AppInfo>&,
              const IntentPickerResponse&);
 
 BubbleShowPtr ShowIntentPickerBubble();
 
 #endif  // OS_CHROMEOS
 
 #endif  // CHROME_BROWSER_UI_BROWSER_DIALOGS_H_