Standardize usage of virtual/override/final specifiers.

content/browser/udev_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.
 
 // UdevLinux listens for device change notifications from udev and runs
 // callbacks when notifications occur.
 //
 // UdevLinux must be created on a MessageLoop of TYPE_IO.
 // UdevLinux is not thread-safe.
 //
@@ skipping 53 matching lines @@
           devtype(devtype_in) {
     }
     const char* subsystem;
     const char* devtype;
   };
 
   // Filter incoming devices based on |filters|.
   // Calls |callback| upon device change events.
   UdevLinux(const std::vector<UdevMonitorFilter>& filters,
             const UdevNotificationCallback& callback);
-  virtual ~UdevLinux();
-
+  ~UdevLinux() override;
 
   // Returns the udev handle to be passed into other udev_*() functions.
   udev* udev_handle();
 
  private:
   // base::MessagePump:Libevent::Watcher implementation.
-  virtual void OnFileCanReadWithoutBlocking(int fd) override;
-  virtual void OnFileCanWriteWithoutBlocking(int fd) override;
+  void OnFileCanReadWithoutBlocking(int fd) override;
+  void OnFileCanWriteWithoutBlocking(int fd) override;
 
   // libudev-related items, the main context, and the monitoring context to be
   // notified about changes to device states.
   device::ScopedUdevPtr udev_;
   device::ScopedUdevMonitorPtr monitor_;
   int monitor_fd_;
   base::MessagePumpLibevent::FileDescriptorWatcher monitor_watcher_;
   UdevNotificationCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(UdevLinux);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_UDEV_LINUX_H_