Standardize usage of virtual/override/final in remoting/

remoting/host/clipboard_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.
 
 #include "remoting/host/clipboard.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
 // Clipboard polling interval in milliseconds.
 const int64 kClipboardPollingIntervalMs = 500;
 
 } // namespace
 
 namespace remoting {
 
 class ClipboardMac : public Clipboard {
  public:
   ClipboardMac();
-  virtual ~ClipboardMac();
+  ~ClipboardMac() override;
 
   // Must be called on the UI thread.
-  virtual void Start(
-      scoped_ptr<protocol::ClipboardStub> client_clipboard) override;
-  virtual void InjectClipboardEvent(
-      const protocol::ClipboardEvent& event) override;
-  virtual void Stop() override;
+  void Start(scoped_ptr<protocol::ClipboardStub> client_clipboard) override;
+  void InjectClipboardEvent(const protocol::ClipboardEvent& event) override;
+  void Stop() override;
 
  private:
   void CheckClipboardForChanges();
 
   scoped_ptr<protocol::ClipboardStub> client_clipboard_;
   scoped_ptr<base::RepeatingTimer<ClipboardMac> > clipboard_polling_timer_;
   NSInteger current_change_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardMac);
 };
@@ skipping 65 matching lines @@
   event.set_mime_type(kMimeTypeTextUtf8);
   event.set_data(base::SysNSStringToUTF8(data));
   client_clipboard_->InjectClipboardEvent(event);
 }
 
 scoped_ptr<Clipboard> Clipboard::Create() {
   return make_scoped_ptr(new ClipboardMac());
 }
 
 }  // namespace remoting