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

chrome/browser/autocomplete/autocomplete_controller.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_AUTOCOMPLETE_CONTROLLER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ skipping 39 matching lines @@
   typedef std::vector<scoped_refptr<AutocompleteProvider> > Providers;
 
   // |provider_types| is a bitmap containing AutocompleteProvider::Type values
   // that will (potentially, depending on platform, flags, etc.) be
   // instantiated. |template_url_service| is used to create URLs from the
   // autocomplete results.
   AutocompleteController(Profile* profile,
                          TemplateURLService* template_url_service,
                          AutocompleteControllerDelegate* delegate,
                          int provider_types);
-  ~AutocompleteController();
+  ~AutocompleteController() override;
 
   // Starts an autocomplete query, which continues until all providers are
   // done or the query is Stop()ed.  It is safe to Start() a new query without
   // Stop()ing the previous one.
   //
   // See AutocompleteInput::AutocompleteInput(...) for more details regarding
   // |input| params.
   //
   // The controller calls AutocompleteControllerDelegate::OnResultChanged() from
   // inside this call at least once. If matches are available later on that
@@ skipping 18 matching lines @@
   // Asks the relevant provider to delete |match|, and ensures observers are
   // notified of resulting changes immediately.  This should only be called when
   // no query is running.
   void DeleteMatch(const AutocompleteMatch& match);
 
   // Removes any entries that were copied from the last result. This is used by
   // the popup to ensure it's not showing an out-of-date query.
   void ExpireCopiedEntries();
 
   // AutocompleteProviderListener:
-  virtual void OnProviderUpdate(bool updated_matches) override;
+  void OnProviderUpdate(bool updated_matches) override;
 
   // Called when an omnibox event log entry is generated.
   // Populates provider_info with diagnostic information about the status
   // of various providers.  In turn, calls
   // AutocompleteProvider::AddProviderInfo() so each provider can add
   // provider-specific information, information we want to log for a particular
   // provider but not others.
   void AddProvidersInfo(ProvidersInfo* provider_info) const;
 
   // Called when a new omnibox session starts.
@@ skipping 144 matching lines @@
   // Are we in Start()? This is used to avoid updating |result_| and sending
   // notifications until Start() has been invoked on all providers.
   bool in_start_;
 
   TemplateURLService* template_url_service_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteController);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CONTROLLER_H_