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

net/quic/crypto/p256_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_P256_KEY_EXCHANGE_H_
 #define NET_QUIC_CRYPTO_P256_KEY_EXCHANGE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 24 matching lines @@
   // |private_key| is invalid, nullptr is returned.
   static P256KeyExchange* New(base::StringPiece private_key);
 
   // |NewPrivateKey| returns a private key, suitable for passing to |New|.
   // If |NewPrivateKey| can't generate a private key, it returns an empty
   // string.
   static std::string NewPrivateKey();
 
   // 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:
   enum {
     // A P-256 field element consists of 32 bytes.
     kP256FieldBytes = 32,
     // A P-256 point in uncompressed form consists of 0x04 (to denote
     // that the point is uncompressed) followed by two, 32-byte field
@@ skipping 17 matching lines @@
   scoped_ptr<crypto::ECPrivateKey> key_pair_;
 #endif
   // The public key stored as an uncompressed P-256 point.
   uint8_t public_key_[kUncompressedP256PointBytes];
 
   DISALLOW_COPY_AND_ASSIGN(P256KeyExchange);
 };
 
 }  // namespace net
 #endif  // NET_QUIC_CRYPTO_P256_KEY_EXCHANGE_H_