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

chrome/browser/extensions/blob_reader.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_EXTENSIONS_BLOB_READER_H_
 #define CHROME_BROWSER_EXTENSIONS_BLOB_READER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 14 matching lines @@
   // |blob_data| contains the portion of the Blob requested. |blob_total_size|
   // is the total size of the Blob, and may be larger than |blob_data->size()|.
   // |blob_total_size| is -1 if it cannot be determined.
   typedef base::Callback<void(scoped_ptr<std::string> blob_data,
                               int64 blob_total_size)>
       BlobReadCallback;
 
   BlobReader(Profile* profile,
              const std::string& blob_uuid,
              BlobReadCallback callback);
-  virtual ~BlobReader();
+  ~BlobReader() override;
 
   void SetByteRange(int64 offset, int64 length);
 
   void Start();
 
  private:
   // Overridden from net::URLFetcherDelegate.
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override;
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   BlobReadCallback callback_;
   scoped_ptr<net::URLFetcher> fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobReader);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_BLOB_READER_H_