Standardize usage of virtual/override/final in sync/

sync/engine/net/server_connection_manager.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SYNC_ENGINE_NET_SERVER_CONNECTION_MANAGER_H_
 #define SYNC_ENGINE_NET_SERVER_CONNECTION_MANAGER_H_
 
 #include <iosfwd>
 #include <string>
 
@@ skipping 165 matching lines @@
    private:
     int ReadResponse(void* buffer, int length);
     int ReadResponse(std::string* buffer, int length);
   };
 
   ServerConnectionManager(const std::string& server,
                           int port,
                           bool use_ssl,
                           CancelationSignal* cancelation_signal);
 
-  virtual ~ServerConnectionManager();
+  ~ServerConnectionManager() override;
 
   // POSTS buffer_in and reads a response into buffer_out. Uses our currently
   // set auth token in our headers.
   //
   // Returns true if executed successfully.
   virtual bool PostBufferWithCachedAuth(PostBufferParams* params,
                                         ScopedServerStatusWatcher* watcher);
 
   void AddListener(ServerConnectionEventListener* listener);
   void RemoveListener(ServerConnectionEventListener* listener);
@@ skipping 13 matching lines @@
   std::string GetServerHost() const;
 
   // Factory method to create an Connection object we can use for
   // communication with the server.
   virtual Connection* MakeConnection();
 
   // Closes any active network connections to the sync server.
   // We expect this to get called on a different thread than the valid
   // ThreadChecker thread, as we want to kill any pending http traffic without
   // having to wait for the request to complete.
-  virtual void OnSignalReceived() override final;
+  void OnSignalReceived() final;
 
   void set_client_id(const std::string& client_id) {
     DCHECK(thread_checker_.CalledOnValidThread());
     DCHECK(client_id_.empty());
     client_id_.assign(client_id);
   }
 
   // Sets a new auth token and time.
   bool SetAuthToken(const std::string& auth_token);
 
@@ skipping 101 matching lines @@
   bool signal_handler_registered_;
 
   DISALLOW_COPY_AND_ASSIGN(ServerConnectionManager);
 };
 
 std::ostream& operator<<(std::ostream& s, const struct HttpResponse& hr);
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_NET_SERVER_CONNECTION_MANAGER_H_