Standardize usage of virtual/override/final in net/

net/socket/unix_domain_listen_socket_posix.h

Index: net/socket/unix_domain_listen_socket_posix.h
diff --git a/net/socket/unix_domain_listen_socket_posix.h b/net/socket/unix_domain_listen_socket_posix.h
index 8b9ba8e21b0fe1ade0a64fb509da2a2139ffaba2..b8f428d4e653d9fdee6af40c635b5d7ffbacd0a2 100644
--- a/net/socket/unix_domain_listen_socket_posix.h
+++ b/net/socket/unix_domain_listen_socket_posix.h
@@ -30,7 +30,7 @@ class NET_EXPORT UnixDomainListenSocket : public StreamListenSocket {
  public:
   typedef UnixDomainServerSocket::AuthCallback AuthCallback;
 
-  virtual ~UnixDomainListenSocket();
+  ~UnixDomainListenSocket() override;
 
   // Note that the returned UnixDomainListenSocket instance does not take
   // ownership of |del|.
@@ -64,7 +64,7 @@ class NET_EXPORT UnixDomainListenSocket : public StreamListenSocket {
       bool use_abstract_namespace);
 
   // StreamListenSocket:
-  virtual void Accept() override;
+  void Accept() override;
 
   AuthCallback auth_callback_;
 
@@ -79,10 +79,10 @@ class NET_EXPORT UnixDomainListenSocketFactory
   UnixDomainListenSocketFactory(
       const std::string& path,
       const UnixDomainListenSocket::AuthCallback& auth_callback);
-  virtual ~UnixDomainListenSocketFactory();
+  ~UnixDomainListenSocketFactory() override;
 
   // StreamListenSocketFactory:
-  virtual scoped_ptr<StreamListenSocket> CreateAndListen(
+  scoped_ptr<StreamListenSocket> CreateAndListen(
       StreamListenSocket::Delegate* delegate) const override;
 
  protected: