Standardize usage of virtual/override/final in mojo/

mojo/services/network/network_service_impl.h

Index: mojo/services/network/network_service_impl.h
diff --git a/mojo/services/network/network_service_impl.h b/mojo/services/network/network_service_impl.h
index 5ae2cfd6fea43d40f9207f869991112568bf9428..5d3376a141f2f6c391f1a816a7cf8a0123d7e62f 100644
--- a/mojo/services/network/network_service_impl.h
+++ b/mojo/services/network/network_service_impl.h
@@ -18,23 +18,23 @@ class NetworkServiceImpl : public InterfaceImpl<NetworkService> {
  public:
   NetworkServiceImpl(ApplicationConnection* connection,
                      NetworkContext* context);
-  virtual ~NetworkServiceImpl();
+  ~NetworkServiceImpl() override;
 
   // NetworkService methods:
-  virtual void CreateURLLoader(InterfaceRequest<URLLoader> loader) override;
-  virtual void GetCookieStore(InterfaceRequest<CookieStore> store) override;
-  virtual void CreateWebSocket(InterfaceRequest<WebSocket> socket) override;
-  virtual void CreateTCPBoundSocket(
+  void CreateURLLoader(InterfaceRequest<URLLoader> loader) override;
+  void GetCookieStore(InterfaceRequest<CookieStore> store) override;
+  void CreateWebSocket(InterfaceRequest<WebSocket> socket) override;
+  void CreateTCPBoundSocket(
       NetAddressPtr local_address,
       InterfaceRequest<TCPBoundSocket> bound_socket,
       const Callback<void(NetworkErrorPtr, NetAddressPtr)>& callback) override;
-  virtual void CreateTCPConnectedSocket(
+  void CreateTCPConnectedSocket(
       NetAddressPtr remote_address,
       ScopedDataPipeConsumerHandle send_stream,
       ScopedDataPipeProducerHandle receive_stream,
       InterfaceRequest<TCPConnectedSocket> client_socket,
       const Callback<void(NetworkErrorPtr, NetAddressPtr)>& callback) override;
-  virtual void CreateUDPSocket(InterfaceRequest<UDPSocket> socket) override;
+  void CreateUDPSocket(InterfaceRequest<UDPSocket> socket) override;
 
  private:
   NetworkContext* context_;