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

content/browser/dom_storage/session_storage_database_adapter.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 CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_DATABASE_ADAPTER_H_
 #define CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_DATABASE_ADAPTER_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/browser/dom_storage/dom_storage_database_adapter.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class SessionStorageDatabase;
 
 class SessionStorageDatabaseAdapter : public DOMStorageDatabaseAdapter {
  public:
   SessionStorageDatabaseAdapter(SessionStorageDatabase* db,
                                 const std::string& permanent_namespace_id,
                                 const GURL& origin);
-  virtual ~SessionStorageDatabaseAdapter();
-  virtual void ReadAllValues(DOMStorageValuesMap* result) override;
-  virtual bool CommitChanges(bool clear_all_first,
-                             const DOMStorageValuesMap& changes) override;
+  ~SessionStorageDatabaseAdapter() override;
+  void ReadAllValues(DOMStorageValuesMap* result) override;
+  bool CommitChanges(bool clear_all_first,
+                     const DOMStorageValuesMap& changes) override;
+
  private:
   scoped_refptr<SessionStorageDatabase> db_;
   std::string permanent_namespace_id_;
   GURL origin_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStorageDatabaseAdapter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_SESSION_STORAGE_DATABASE_ADAPTER_H_