app_list::SearchResult: Duplicate() is const.

chrome/browser/ui/app_list/search/omnibox_result.h

 // Copyright 2014 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_APP_LIST_SEARCH_OMNIBOX_RESULT_H_
 #define CHROME_BROWSER_UI_APP_LIST_SEARCH_OMNIBOX_RESULT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "components/omnibox/autocomplete_match.h"
 #include "ui/app_list/search_result.h"
 
 class AppListControllerDelegate;
 class AutocompleteController;
 class Profile;
 
 namespace app_list {
 
 class OmniboxResult : public SearchResult {
  public:
   OmniboxResult(Profile* profile,
                 AppListControllerDelegate* list_controller,
                 AutocompleteController* autocomplete_controller,
                 bool is_voice_query,
                 const AutocompleteMatch& match);
   ~OmniboxResult() override;
 
   // SearchResult overrides:
   void Open(int event_flags) override;
 
-  scoped_ptr<SearchResult> Duplicate() override;
+  scoped_ptr<SearchResult> Duplicate() const override;
 
  private:
   void UpdateIcon();
 
   void UpdateTitleAndDetails();
 
   Profile* profile_;
   AppListControllerDelegate* list_controller_;
   AutocompleteController* autocomplete_controller_;
   bool is_voice_query_;
   AutocompleteMatch match_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxResult);
 };
 
 }  // namespace app_list
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_OMNIBOX_RESULT_H_