Update {virtual,override,final} to follow C++11 style in media, round 2.

media/video/capture/linux/video_capture_device_chromeos.cc

 // Copyright 2014 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.
 
 #include "media/video/capture/linux/video_capture_device_chromeos.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "ui/gfx/display.h"
@@ skipping 23 matching lines @@
     DCHECK(capture_task_runner_->BelongsToCurrentThread());
     capture_device_ = NULL;
     ui_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&ScreenObserverDelegate::RemoveObserverOnUIThread, this));
   }
 
  private:
   friend class base::RefCountedThreadSafe<ScreenObserverDelegate>;
 
-  virtual ~ScreenObserverDelegate() {
-    DCHECK(!capture_device_);
-  }
+  ~ScreenObserverDelegate() override { DCHECK(!capture_device_); }
 
-  virtual void OnDisplayAdded(const gfx::Display& /*new_display*/) override {}
-  virtual void OnDisplayRemoved(const gfx::Display& /*old_display*/) override {}
-  virtual void OnDisplayMetricsChanged(const gfx::Display& display,
-                                       uint32_t metrics) override {
+  void OnDisplayAdded(const gfx::Display& /*new_display*/) override {}
+  void OnDisplayRemoved(const gfx::Display& /*old_display*/) override {}
+  void OnDisplayMetricsChanged(const gfx::Display& display,
+                               uint32_t metrics) override {
     DCHECK(ui_task_runner_->BelongsToCurrentThread());
     if (!(metrics & DISPLAY_METRIC_ROTATION))
       return;
     SendDisplayRotation(display);
   }
 
   void AddObserverOnUIThread() {
     DCHECK(ui_task_runner_->BelongsToCurrentThread());
     gfx::Screen* screen =
         gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_ALTERNATE);
@@ skipping 45 matching lines @@
   screen_observer_delegate_->RemoveObserver();
 }
 
 void VideoCaptureDeviceChromeOS::SetDisplayRotation(
     const gfx::Display& display) {
   if (display.IsInternal())
     SetRotation(display.rotation() * 90);
 }
 
 }  // namespace media