Standardize usage of virtual/override/final in chrome/browser/media

chrome/browser/media/midi_permission_infobar_delegate.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 CHROME_BROWSER_MEDIA_MIDI_PERMISSION_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_MEDIA_MIDI_PERMISSION_INFOBAR_DELEGATE_H_
 
 #include <string>
 #include "chrome/browser/content_settings/permission_infobar_delegate.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ skipping 16 matching lines @@
                                    const std::string& display_languages,
                                    ContentSettingsType type);
 
  private:
   MidiPermissionInfoBarDelegate(PermissionQueueController* controller,
                                 const PermissionRequestID& id,
                                 const GURL& requesting_frame,
                                 int contents_unique_id,
                                 const std::string& display_languages,
                                 ContentSettingsType type);
-  virtual ~MidiPermissionInfoBarDelegate();
+  ~MidiPermissionInfoBarDelegate() override;
 
   // ConfirmInfoBarDelegate:
-  virtual base::string16 GetMessageText() const override;
-  virtual int GetIconID() const override;
+  base::string16 GetMessageText() const override;
+  int GetIconID() const override;
 
   GURL requesting_frame_;
   std::string display_languages_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiPermissionInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MIDI_PERMISSION_INFOBAR_DELEGATE_H_