Standardize usage of virtual/override/final in extensions/

extensions/browser/api/bluetooth_low_energy/bluetooth_low_energy_connection.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_BLUETOOTH_LOW_ENERGY_BLUETOOTH_LOW_ENERGY_CONNECTION_H_
 #define EXTENSIONS_BROWSER_API_BLUETOOTH_LOW_ENERGY_BLUETOOTH_LOW_ENERGY_CONNECTION_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "device/bluetooth/bluetooth_gatt_connection.h"
 #include "extensions/browser/api/api_resource.h"
 #include "extensions/browser/api/api_resource_manager.h"
 
 namespace extensions {
 
 // An ApiResource wrapper for a device::BluetoothGattConnection.
 class BluetoothLowEnergyConnection : public ApiResource {
  public:
   explicit BluetoothLowEnergyConnection(
       bool persistent,
       const std::string& owner_extension_id,
       scoped_ptr<device::BluetoothGattConnection> connection);
-  virtual ~BluetoothLowEnergyConnection();
+  ~BluetoothLowEnergyConnection() override;
 
   // Returns a pointer to the underlying connection object.
   device::BluetoothGattConnection* GetConnection() const;
 
   // ApiResource override.
-  virtual bool IsPersistent() const override;
+  bool IsPersistent() const override;
 
   // This resource should be managed on the UI thread.
   static const content::BrowserThread::ID kThreadId =
       content::BrowserThread::UI;
 
  private:
   friend class ApiResourceManager<BluetoothLowEnergyConnection>;
   static const char* service_name() {
     return "BluetoothLowEnergyConnectionManager";
   }
 
   // True, if this resource should be persistent.
   bool persistent_;
 
   // The connection is owned by this instance and will automatically disconnect
   // when deleted.
   scoped_ptr<device::BluetoothGattConnection> connection_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyConnection);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_BLUETOOTH_LOW_ENERGY_BLUETOOTH_LOW_ENERGY_CONNECTION_H_