Standardize usage of virtual/override/final in content/

content/common/socket_stream_handle_data.h

 // 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.
 
 #ifndef CONTENT_RENDERER_SOCKET_STREAM_HANDLE_DATA_H_
 #define CONTENT_RENDERER_SOCKET_STREAM_HANDLE_DATA_H_
 
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // User data stored in each WebSocketStreamHandleImpl.
 class SocketStreamHandleData : public base::SupportsUserData::Data {
  public:
   explicit SocketStreamHandleData(int render_frame_id)
       : render_frame_id_(render_frame_id) {}
-  virtual ~SocketStreamHandleData() {}
+  ~SocketStreamHandleData() override {}
 
   int render_frame_id() const { return render_frame_id_; }
 
  private:
   int render_frame_id_;
 
   DISALLOW_COPY_AND_ASSIGN(SocketStreamHandleData);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SOCKET_STREAM_HANDLE_DATA_H_