Switch "const StringPiece&" to just "StringPiece" in QUIC code. No functional change. Not flag prot…

net/quic/crypto/curve25519_key_exchange.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 NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
 #define NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/quic/crypto/key_exchange.h"
 
 namespace net {
 
 class QuicRandom;
 
 // Curve25519KeyExchange implements a KeyExchange using elliptic-curve
 // Diffie-Hellman on curve25519. See http://cr.yp.to/ecdh.html
 class NET_EXPORT_PRIVATE Curve25519KeyExchange : public KeyExchange {
  public:
   ~Curve25519KeyExchange() override;
 
   // New creates a new object from a private key. If the private key is
   // invalid, nullptr is returned.
-  static Curve25519KeyExchange* New(const base::StringPiece& private_key);
+  static Curve25519KeyExchange* New(base::StringPiece private_key);
 
   // NewPrivateKey returns a private key, generated from |rand|, suitable for
   // passing to |New|.
   static std::string NewPrivateKey(QuicRandom* rand);
 
   // KeyExchange interface.
   KeyExchange* NewKeyPair(QuicRandom* rand) const override;
-  bool CalculateSharedKey(const base::StringPiece& peer_public_value,
+  bool CalculateSharedKey(base::StringPiece peer_public_value,
                           std::string* shared_key) const override;
   base::StringPiece public_value() const override;
   QuicTag tag() const override;
 
  private:
   Curve25519KeyExchange();
 
   uint8_t private_key_[32];
   uint8_t public_key_[32];
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CURVE25519_KEY_EXCHANGE_H_