Update from https://crrev.com/309717

crypto/nss_crypto_module_delegate.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 CRYPTO_NSS_CRYPTO_MODULE_DELEGATE_H_
 #define CRYPTO_NSS_CRYPTO_MODULE_DELEGATE_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 24 matching lines @@
   // user entered.
   virtual std::string RequestPassword(const std::string& slot_name, bool retry,
                                       bool* cancelled) = 0;
 
 };
 
 // Extends CryptoModuleBlockingPasswordDelegate with the ability to return a
 // slot in which to act. (Eg, which slot to store a generated key in.)
 class NSSCryptoModuleDelegate : public CryptoModuleBlockingPasswordDelegate {
  public:
-  virtual ~NSSCryptoModuleDelegate() {}
+  ~NSSCryptoModuleDelegate() override {}
 
   // Get the slot to store the generated key.
   virtual ScopedPK11Slot RequestSlot() = 0;
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_NSS_CRYPTO_MODULE_DELEGATE_H_