Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/webui/net_export_ui.cc

Index: chrome/browser/ui/webui/net_export_ui.cc
diff --git a/chrome/browser/ui/webui/net_export_ui.cc b/chrome/browser/ui/webui/net_export_ui.cc
index 651fcf83214e0aa62b4f8d2f21957015e3982fbc..dd77a7082945364daa2cb3b16c9e2c8a16cdcbc1 100644
--- a/chrome/browser/ui/webui/net_export_ui.cc
+++ b/chrome/browser/ui/webui/net_export_ui.cc
@@ -53,10 +53,10 @@ class NetExportMessageHandler
       public base::SupportsWeakPtr<NetExportMessageHandler> {
  public:
   NetExportMessageHandler();
-  virtual ~NetExportMessageHandler();
+  ~NetExportMessageHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
   // Messages.
   void OnGetExportNetLogInfo(const base::ListValue* list);