Standardize usage of virtual/override/final specifiers.

net/base/address_tracker_linux.h

 // Copyright (c) 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 NET_BASE_ADDRESS_TRACKER_LINUX_H_
 #define NET_BASE_ADDRESS_TRACKER_LINUX_H_
 
 #include <sys/socket.h>  // Needed to include netlink.
 // Mask superfluous definition of |struct net|. This is fixed in Linux 2.6.38.
 #define net net_kernel
@@ skipping 29 matching lines @@
   // GetAddressMap().
   AddressTrackerLinux();
 
   // Tracking version constructor: it will run |address_callback| when
   // the AddressMap changes, |link_callback| when the list of online
   // links changes, and |tunnel_callback| when the list of online
   // tunnels changes.
   AddressTrackerLinux(const base::Closure& address_callback,
                       const base::Closure& link_callback,
                       const base::Closure& tunnel_callback);
-  virtual ~AddressTrackerLinux();
+  ~AddressTrackerLinux() override;
 
   // In tracking mode, it starts watching the system configuration for
   // changes. The current thread must have a MessageLoopForIO. In
   // non-tracking mode, once Init() returns, a snapshot of the system
   // configuration is available through GetOnlineLinks() and
   // GetAddressMap().
   void Init();
 
   AddressMap GetAddressMap() const;
 
@@ skipping 40 matching lines @@
   void HandleMessage(char* buffer,
                      size_t length,
                      bool* address_changed,
                      bool* link_changed,
                      bool* tunnel_changed);
 
   // Call when some part of initialization failed; forces online and unblocks.
   void AbortAndForceOnline();
 
   // MessageLoopForIO::Watcher:
-  virtual void OnFileCanReadWithoutBlocking(int fd) override;
-  virtual void OnFileCanWriteWithoutBlocking(int /* fd */) override;
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int /* fd */) override;
 
   // Close |netlink_fd_|
   void CloseSocket();
 
   // Does |msg| refer to a tunnel interface?
   bool IsTunnelInterface(const struct ifinfomsg* msg) const;
 
   // Gets the name of an interface given the interface index |interface_index|.
   // May return empty string if it fails but should not return NULL. This is
   // overridden by tests.
@@ skipping 20 matching lines @@
   bool tracking_;
 
   // Used to verify single-threaded access in non-tracking mode.
   base::ThreadChecker thread_checker_;
 };
 
 }  // namespace internal
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_TRACKER_LINUX_H_