Standardize usage of virtual/override/final in remoting/

remoting/host/video_scheduler.h

Index: remoting/host/video_scheduler.h
diff --git a/remoting/host/video_scheduler.h b/remoting/host/video_scheduler.h
index 795e8e2cb87d153027c5a8b6a4d98b1895e88693..825f07af6f14271d57253e732d14fcd63a563732 100644
--- a/remoting/host/video_scheduler.h
+++ b/remoting/host/video_scheduler.h
@@ -95,15 +95,13 @@ class VideoScheduler : public base::RefCountedThreadSafe<VideoScheduler>,
       protocol::VideoStub* video_stub);
 
   // webrtc::DesktopCapturer::Callback implementation.
-  virtual webrtc::SharedMemory* CreateSharedMemory(size_t size) override;
-  virtual void OnCaptureCompleted(webrtc::DesktopFrame* frame) override;
+  webrtc::SharedMemory* CreateSharedMemory(size_t size) override;
+  void OnCaptureCompleted(webrtc::DesktopFrame* frame) override;
 
   // webrtc::MouseCursorMonitor::Callback implementation.
-  virtual void OnMouseCursor(
-      webrtc::MouseCursor* mouse_cursor) override;
-  virtual void OnMouseCursorPosition(
-      webrtc::MouseCursorMonitor::CursorState state,
-      const webrtc::DesktopVector& position) override;
+  void OnMouseCursor(webrtc::MouseCursor* mouse_cursor) override;
+  void OnMouseCursorPosition(webrtc::MouseCursorMonitor::CursorState state,
+                             const webrtc::DesktopVector& position) override;
 
   // Starts scheduling frame captures.
   void Start();
@@ -127,7 +125,7 @@ class VideoScheduler : public base::RefCountedThreadSafe<VideoScheduler>,
 
  private:
   friend class base::RefCountedThreadSafe<VideoScheduler>;
-  virtual ~VideoScheduler();
+  ~VideoScheduler() override;
 
   // Capturer thread ----------------------------------------------------------