Remove path id from IV in QUIC encrytion algorithms.

net/quic/core/crypto/null_encrypter.h

 // Copyright (c) 2012 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_CORE_CRYPTO_NULL_ENCRYPTER_H_
 #define NET_QUIC_CORE_CRYPTO_NULL_ENCRYPTER_H_
 
 #include <cstddef>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "net/quic/core/crypto/quic_encrypter.h"
 #include "net/quic/core/quic_types.h"
 #include "net/quic/platform/api/quic_export.h"
 
 namespace net {
 
 // A NullEncrypter is a QuicEncrypter used before a crypto negotiation
 // has occurred.  It does not actually encrypt the payload, but does
 // generate a MAC (fnv128) over both the payload and associated data.
 class QUIC_EXPORT_PRIVATE NullEncrypter : public QuicEncrypter {
  public:
   explicit NullEncrypter(Perspective perspective);
   ~NullEncrypter() override {}
 
   // QuicEncrypter implementation
   bool SetKey(base::StringPiece key) override;
   bool SetNoncePrefix(base::StringPiece nonce_prefix) override;
   bool EncryptPacket(QuicVersion version,
-                     QuicPathId path_id,
                      QuicPacketNumber packet_number,
                      base::StringPiece associated_data,
                      base::StringPiece plaintext,
                      char* output,
                      size_t* output_length,
                      size_t max_output_length) override;
   size_t GetKeySize() const override;
   size_t GetNoncePrefixSize() const override;
   size_t GetMaxPlaintextSize(size_t ciphertext_size) const override;
   size_t GetCiphertextSize(size_t plaintext_size) const override;
   base::StringPiece GetKey() const override;
   base::StringPiece GetNoncePrefix() const override;
 
  private:
   size_t GetHashLength() const;
 
   Perspective perspective_;
 
   DISALLOW_COPY_AND_ASSIGN(NullEncrypter);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CRYPTO_NULL_ENCRYPTER_H_