Standardize usage of virtual/override/final in remoting/

remoting/host/continue_window_mac.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 17 matching lines @@
 - (void)onContinue:(id)sender;
 @end
 
 namespace remoting {
 
 // A bridge between C++ and ObjC implementations of ContinueWindow.
 // Everything important occurs in ContinueWindowMacController.
 class ContinueWindowMac : public ContinueWindow {
  public:
   ContinueWindowMac();
-  virtual ~ContinueWindowMac();
+  ~ContinueWindowMac() override;
 
  protected:
   // ContinueWindow overrides.
-  virtual void ShowUi() override;
-  virtual void HideUi() override;
+  void ShowUi() override;
+  void HideUi() override;
 
  private:
   base::scoped_nsobject<ContinueWindowMacController> controller_;
 
   DISALLOW_COPY_AND_ASSIGN(ContinueWindowMac);
 };
 
 ContinueWindowMac::ContinueWindowMac() {
 }
 
@@ skipping 101 matching lines @@
   [self hide];
   continue_window_->DisconnectSession();
 }
 
 - (void)onContinue:(id)sender {
   [self hide];
   continue_window_->ContinueSession();
 }
 
 @end