Standardize usage of virtual/override/final in mojo/

mojo/public/cpp/application/lib/service_registry.h

Index: mojo/public/cpp/application/lib/service_registry.h
diff --git a/mojo/public/cpp/application/lib/service_registry.h b/mojo/public/cpp/application/lib/service_registry.h
index 2ac8eb89c087ce78e4dd4876ae35fde62f1d5da9..b02f63da4dbe254fbd1d35be25fc587fc1dc944f 100644
--- a/mojo/public/cpp/application/lib/service_registry.h
+++ b/mojo/public/cpp/application/lib/service_registry.h
@@ -26,22 +26,20 @@ class ServiceRegistry : public ServiceProvider, public ApplicationConnection {
   ServiceRegistry(ApplicationImpl* application_impl,
                   const std::string& url,
                   ServiceProviderPtr service_provider);
-  virtual ~ServiceRegistry();
+  ~ServiceRegistry() override;
 
   // ApplicationConnection overrides.
-  virtual void AddServiceConnector(
-      ServiceConnectorBase* service_connector) override;
-  virtual const std::string& GetRemoteApplicationURL() override;
-  virtual ApplicationConnection* ConnectToApplication(
-      const std::string& url) override;
-  virtual ServiceProvider* GetServiceProvider() override;
+  void AddServiceConnector(ServiceConnectorBase* service_connector) override;
+  const std::string& GetRemoteApplicationURL() override;
+  ApplicationConnection* ConnectToApplication(const std::string& url) override;
+  ServiceProvider* GetServiceProvider() override;
 
   virtual void RemoveServiceConnector(ServiceConnectorBase* service_connector);
 
  private:
   // ServiceProvider method.
-  virtual void ConnectToService(const mojo::String& service_name,
-                                ScopedMessagePipeHandle client_handle) override;
+  void ConnectToService(const mojo::String& service_name,
+                        ScopedMessagePipeHandle client_handle) override;
 
   ApplicationImpl* application_impl_;
   const std::string url_;