Standardize usage of virtual/override/final in storage/

storage/browser/blob/blob_data_handle.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 STORAGE_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
 #define STORAGE_BROWSER_BLOB_BLOB_DATA_HANDLE_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 11 matching lines @@
 class BlobStorageContext;
 
 // A scoper object for use in chrome's main browser process, ensures
 // the underlying BlobData and its uuid remain in BlobStorageContext's
 // collection for the duration. This object has delete semantics and
 // maybe deleted on any thread.
 class STORAGE_EXPORT BlobDataHandle
     : public base::SupportsUserData::Data {
  public:
   BlobDataHandle(const BlobDataHandle& other);  // May be copied on any thread.
-  virtual ~BlobDataHandle();  // Maybe be deleted on any thread.
+  ~BlobDataHandle() override;  // Maybe be deleted on any thread.
   BlobData* data() const;  // May only be accessed on the IO thread.
 
   std::string uuid() const;  // May be accessed on any thread.
 
  private:
   class BlobDataHandleShared
       : public base::RefCountedThreadSafe<BlobDataHandleShared> {
    public:
     BlobDataHandleShared(BlobData* blob_data,
                          BlobStorageContext* context,
@@ skipping 19 matching lines @@
   BlobDataHandle(BlobData* blob_data, BlobStorageContext* context,
                  base::SequencedTaskRunner* task_runner);
 
   scoped_refptr<base::SequencedTaskRunner> io_task_runner_;
   scoped_refptr<BlobDataHandleShared> shared_;
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_BLOB_BLOB_DATA_HANDLE_H_