Standardize usage of virtual/override/final in remoting/

remoting/host/host_window_proxy.h

 // Copyright 2013 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 REMOTING_HOST_HOST_WINDOW_PROXY_H_
 #define REMOTING_HOST_HOST_WINDOW_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/host/host_window.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace remoting {
 
 // Takes an instance of |HostWindow| and runs it on the |ui_task_runner| thread.
 class HostWindowProxy : public HostWindow {
  public:
   HostWindowProxy(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       scoped_ptr<HostWindow> host_window);
-  virtual ~HostWindowProxy();
+  ~HostWindowProxy() override;
 
   // HostWindow overrides.
-  virtual void Start(
-      const base::WeakPtr<ClientSessionControl>& client_session_control)
+  void Start(const base::WeakPtr<ClientSessionControl>& client_session_control)
       override;
 
  private:
   // All thread switching logic is implemented in the ref-counted |Core| class.
   class Core;
   scoped_refptr<Core> core_;
 
   DISALLOW_COPY_AND_ASSIGN(HostWindowProxy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_HOST_WINDOW_PROXY_H_