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

net/quic/core/crypto/quic_crypto_server_config.cc

 // 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.
 
 #include "net/quic/core/crypto/quic_crypto_server_config.h"
 
 #include <stdlib.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 849 matching lines @@
           QUIC_NO_ERROR ||
       client_hello.GetTaglist(kKEXS, &their_key_exchanges,
                               &num_their_key_exchanges) != QUIC_NO_ERROR ||
       num_their_aeads != 1 || num_their_key_exchanges != 1) {
     helper.Fail(QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER,
                 "Missing or invalid AEAD or KEXS");
     return;
   }
 
   size_t key_exchange_index;
-  if (!QuicUtils::FindMutualTag(requested_config->aead, their_aeads,
-                                num_their_aeads, &params->aead, nullptr) ||
-      !QuicUtils::FindMutualTag(requested_config->kexs, their_key_exchanges,
-                                num_their_key_exchanges, &params->key_exchange,
-                                &key_exchange_index)) {
+  if (!FindMutualQuicTag(requested_config->aead, their_aeads, num_their_aeads,
+                         &params->aead, nullptr) ||
+      !FindMutualQuicTag(requested_config->kexs, their_key_exchanges,
+                         num_their_key_exchanges, &params->key_exchange,
+                         &key_exchange_index)) {
     helper.Fail(QUIC_CRYPTO_NO_SUPPORT, "Unsupported AEAD or KEXS");
     return;
   }
 
   if (!requested_config->tb_key_params.empty()) {
     const QuicTag* their_tbkps;
     size_t num_their_tbkps;
     switch (client_hello.GetTaglist(kTBKP, &their_tbkps, &num_their_tbkps)) {
       case QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND:
         break;
       case QUIC_NO_ERROR:
-        if (QuicUtils::FindMutualTag(
-                requested_config->tb_key_params, their_tbkps, num_their_tbkps,
-                &params->token_binding_key_param, nullptr)) {
+        if (FindMutualQuicTag(requested_config->tb_key_params, their_tbkps,
+                              num_their_tbkps, &params->token_binding_key_param,
+                              nullptr)) {
           break;
         }
       default:
         helper.Fail(QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER,
                     "Invalid Token Binding key parameter");
         return;
     }
   }
 
   StringPiece public_value;
@@ skipping 1303 matching lines @@
       source_address_token_boxer(nullptr) {}
 
 QuicCryptoServerConfig::Config::~Config() {
 }
 
 QuicSignedServerConfig::QuicSignedServerConfig()
     : send_expect_ct_header(false) {}
 QuicSignedServerConfig::~QuicSignedServerConfig() {}
 
 }  // namespace net