Add SearchProvider's most relevant NavigationResult to |matches_|.

chrome/browser/autocomplete/search_provider.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.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all non-keyword autocomplete entries that start with
 // "Search <engine> for ...", including searching for the current input string,
 // search history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 //
@@ skipping 218 matching lines @@
                            const string16& input_text,
                            SuggestResults* suggest_results);
 
   // Converts the parsed results to a set of AutocompleteMatches and adds them
   // to |matches_|.  This also sets |done_| correctly.
   void ConvertResultsToAutocompleteMatches();
 
   // Converts the first navigation result in |navigation_results| to an
   // AutocompleteMatch and adds it to |matches_|.
   void AddNavigationResultsToMatches(
-      const NavigationResults& navigation_results,
+      NavigationResults navigation_results,
       bool is_keyword);
 
   // Adds a match for each result in |results| to |map|. |is_keyword| indicates
   // whether the results correspond to the keyword provider or default provider.
   void AddHistoryResultsToMap(const HistoryResults& results,
                               bool is_keyword,
                               int did_not_accept_suggestion,
                               MatchMap* map);
 
   // Calculates relevance scores for all |results|.
@@ skipping 93 matching lines @@
   // Has FinalizeInstantQuery been invoked since the last |Start|?
   bool instant_finalized_;
 
   // The |suggest_text| parameter passed to FinalizeInstantQuery.
   string16 default_provider_suggest_text_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_