Moves QuicTag typedefs, and QuicTag utility methods to quic_tag.{h,cc}. No behavior change.

net/quic/test_tools/crypto_test_utils.cc

 // 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.
 
 #include "net/quic/test_tools/crypto_test_utils.h"
 
 #include <memory>
 
 #include "base/strings/string_util.h"
 #include "crypto/openssl_util.h"
@@ skipping 941 matching lines @@
     QuicCryptoServerConfig* crypto_config) {
   // clang-format off
   return CryptoTestUtils::Message(
       "CHLO",
       "PDMD", "X509",
       "AEAD", "AESG",
       "KEXS", "C255",
       "PUBS", CryptoTestUtils::GenerateClientPublicValuesHex().c_str(),
       "NONC", CryptoTestUtils::GenerateClientNonceHex(clock,
                                                       crypto_config).c_str(),
-      "VER\0", QuicUtils::TagToString(
+      "VER\0", QuicTagToString(
           QuicVersionToQuicTag(version)).c_str(),
       "$padding", static_cast<int>(kClientHelloMinimumSize),
       nullptr);
   // clang-format on
 }
 
 string CryptoTestUtils::GenerateClientNonceHex(
     const QuicClock* clock,
     QuicCryptoServerConfig* crypto_config) {
   net::QuicCryptoServerConfig::ConfigOptions old_config_options;
@@ skipping 38 matching lines @@
   // Pass a inchoate CHLO.
   FullChloGenerator generator(crypto_config, server_ip, client_addr, clock,
                               proof, compressed_certs_cache, out);
   crypto_config->ValidateClientHello(
       inchoate_chlo, client_addr.address(), server_ip, version, clock, proof,
       generator.GetValidateClientHelloCallback());
 }
 
 }  // namespace test
 }  // namespace net