Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/autocomplete/history_url_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.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 175 matching lines @@
   // Various values used in scoring, made public so other providers
   // can insert results in appropriate ranges relative to these.
   static const int kScoreForBestInlineableResult;
   static const int kScoreForUnvisitedIntranetResult;
   static const int kScoreForWhatYouTypedResult;
   static const int kBaseScoreForNonInlineableResult;
 
   HistoryURLProvider(AutocompleteProviderListener* listener, Profile* profile);
 
   // HistoryProvider:
-  virtual void Start(const AutocompleteInput& input,
-                     bool minimal_changes,
-                     bool called_due_to_focus) override;
-  virtual void Stop(bool clear_cached_results,
-                    bool due_to_user_inactivity) override;
+  void Start(const AutocompleteInput& input,
+             bool minimal_changes,
+             bool called_due_to_focus) override;
+  void Stop(bool clear_cached_results, bool due_to_user_inactivity) override;
 
   // Returns a match representing a navigation to |destination_url| given user
   // input of |text|.  |trim_http| controls whether the match's |fill_into_edit|
   // and |contents| should have any HTTP scheme stripped off, and should not be
   // set to true if |text| contains an http prefix.
   // NOTES: This does not set the relevance of the returned match, as different
   //        callers want different behavior. Callers must set this manually.
   //        This function should only be called on the UI thread.
   AutocompleteMatch SuggestExactInput(const base::string16& text,
                                       const GURL& destination_url,
@@ skipping 11 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(HistoryURLProviderTest, HUPScoringExperiment);
 
   enum MatchType {
     NORMAL,
     WHAT_YOU_TYPED,
     INLINE_AUTOCOMPLETE,
     UNVISITED_INTRANET,  // An intranet site that has never been visited.
   };
   class VisitClassifier;
 
-  ~HistoryURLProvider();
+  ~HistoryURLProvider() override;
 
   // Determines the relevance for a match, given its type.  If |match_type| is
   // NORMAL, |match_number| is a number indicating the relevance of the match
   // (higher == more relevant).  For other values of |match_type|,
   // |match_number| is ignored.  Only called some of the time; for some matches,
   // relevancy scores are assigned consecutively decreasing (1416, 1415, ...).
   static int CalculateRelevance(MatchType match_type, int match_number);
 
   // Returns a set of classifications that highlight all the occurrences of
   // |input_text| at word breaks in |description|.
@@ skipping 90 matching lines @@
   // keep this member is so we can set the cancel bit on it.
   HistoryURLProviderParams* params_;
 
   // Params controlling experimental behavior of this provider.
   HUPScoringParams scoring_params_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryURLProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_