Standardize usage of virtual/override/final in chrome/

chrome/service/cloud_print/cloud_print_proxy.h

Index: chrome/service/cloud_print/cloud_print_proxy.h
diff --git a/chrome/service/cloud_print/cloud_print_proxy.h b/chrome/service/cloud_print/cloud_print_proxy.h
index 7f839d1806cbe84d9ec70e65a7857f38855d96a1..4f7daa065c407b864c379b88f683b6fc204bd778 100644
--- a/chrome/service/cloud_print/cloud_print_proxy.h
+++ b/chrome/service/cloud_print/cloud_print_proxy.h
@@ -34,7 +34,7 @@ class CloudPrintProxy : public CloudPrintProxyFrontend,
     virtual void OnCloudPrintProxyDisabled(bool persist_state) {}
   };
   CloudPrintProxy();
-  virtual ~CloudPrintProxy();
+  ~CloudPrintProxy() override;
 
   // Initializes the object. This should be called every time an object of this
   // class is constructed.
@@ -62,18 +62,17 @@ class CloudPrintProxy : public CloudPrintProxyFrontend,
   }
 
   // CloudPrintProxyFrontend implementation. Called on UI thread.
-  virtual void OnAuthenticated(const std::string& robot_oauth_refresh_token,
-                               const std::string& robot_email,
-                               const std::string& user_email) override;
-  virtual void OnAuthenticationFailed() override;
-  virtual void OnPrintSystemUnavailable() override;
-  virtual void OnUnregisterPrinters(
-      const std::string& auth_token,
-      const std::list<std::string>& printer_ids) override;
-  virtual void OnXmppPingUpdated(int ping_timeout) override;
+  void OnAuthenticated(const std::string& robot_oauth_refresh_token,
+                       const std::string& robot_email,
+                       const std::string& user_email) override;
+  void OnAuthenticationFailed() override;
+  void OnPrintSystemUnavailable() override;
+  void OnUnregisterPrinters(const std::string& auth_token,
+                            const std::list<std::string>& printer_ids) override;
+  void OnXmppPingUpdated(int ping_timeout) override;
 
   // CloudPrintWipeout::Client implementation.
-  virtual void OnUnregisterPrintersComplete() override;
+  void OnUnregisterPrintersComplete() override;
 
  protected:
   void ShutdownBackend();