Standardize usage of virtual/override/final in content/browser/

content/browser/streams/stream_handle_impl.h

 // Copyright (c) 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 CONTENT_BROWSER_STREAMS_STREAM_HANDLE_IMPL_H_
 #define CONTENT_BROWSER_STREAMS_STREAM_HANDLE_IMPL_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/stream_handle.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace content {
 
 class Stream;
 
 class StreamHandleImpl : public StreamHandle {
  public:
   StreamHandleImpl(const base::WeakPtr<Stream>& stream);
-  virtual ~StreamHandleImpl();
+  ~StreamHandleImpl() override;
 
  private:
   // StreamHandle overrides
-  virtual const GURL& GetURL() override;
-  virtual void AddCloseListener(const base::Closure& callback) override;
+  const GURL& GetURL() override;
+  void AddCloseListener(const base::Closure& callback) override;
 
   base::WeakPtr<Stream> stream_;
   GURL url_;
   base::MessageLoopProxy* stream_message_loop_;
   std::vector<base::Closure> close_listeners_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_STREAMS_STREAM_HANDLE_IMPL_H_