app_list::SearchResult: Duplicate() is const.

ui/app_list/search/mixer_unittest.cc

 // Copyright 2013 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 <set>
 #include <string>
 
 #include "base/memory/scoped_vector.h"
 #include "base/strings/string16.h"
 #include "base/strings/stringprintf.h"
@@ skipping 16 matching lines @@
     set_title(base::UTF8ToUTF16(id));
     set_relevance(relevance);
   }
   ~TestSearchResult() override {}
 
   using SearchResult::set_voice_result;
 
   // SearchResult overrides:
   void Open(int event_flags) override {}
   void InvokeAction(int action_index, int event_flags) override {}
-  scoped_ptr<SearchResult> Duplicate() override {
+  scoped_ptr<SearchResult> Duplicate() const override {
     return scoped_ptr<SearchResult>(new TestSearchResult(id(), relevance()));
   }
 
   // For reference equality testing. (Addresses cannot be used to test reference
   // equality because it is possible that an object will be allocated at the
   // same address as a previously deleted one.)
   static int GetInstanceId(SearchResult* result) {
     return static_cast<const TestSearchResult*>(result)->instance_id_;
   }
 
@@ skipping 275 matching lines @@
   EXPECT_EQ(old_ui_result_ids[0],
             TestSearchResult::GetInstanceId(ui_results.GetItemAt(3)));
   EXPECT_EQ(old_ui_result_ids[1],
             TestSearchResult::GetInstanceId(ui_results.GetItemAt(0)));
   EXPECT_EQ(old_ui_result_ids[2],
             TestSearchResult::GetInstanceId(ui_results.GetItemAt(2)));
 }
 
 }  // namespace test
 }  // namespace app_list