Standardize usage of virtual/override/final in storage/

storage/browser/fileapi/file_system_operation_context.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 STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
 #define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_
 
 #include "base/files/file_path.h"
 #include "base/supports_user_data.h"
 #include "base/threading/thread_checker.h"
@@ skipping 18 matching lines @@
 class STORAGE_EXPORT_PRIVATE FileSystemOperationContext
     : public base::SupportsUserData {
  public:
   explicit FileSystemOperationContext(FileSystemContext* context);
 
   // Specifies |task_runner| which the operation is performed on.
   // The backend of |task_runner| must outlive the IO thread.
   FileSystemOperationContext(FileSystemContext* context,
                              base::SequencedTaskRunner* task_runner);
 
-  virtual ~FileSystemOperationContext();
+  ~FileSystemOperationContext() override;
 
   FileSystemContext* file_system_context() const {
     return file_system_context_.get();
   }
 
   // Updates the current remaining quota.
   // This can be called to update the remaining quota during the operation.
   void set_allowed_bytes_growth(const int64& allowed_bytes_growth) {
     allowed_bytes_growth_ = allowed_bytes_growth;
   }
@@ skipping 38 matching lines @@
 
   // Used to check its setters are not called on arbitrary thread.
   base::ThreadChecker setter_thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemOperationContext);
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_OPERATION_CONTEXT_H_