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

net/quic/core/quic_framer.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/core/quic_framer.h"
 
 #include <cstdint>
 #include <memory>
 #include <vector>
 
@@ skipping 673 matching lines @@
       }
       break;
   }
   last_serialized_connection_id_ = header.public_header.connection_id;
 
   if (header.public_header.version_flag) {
     DCHECK_EQ(Perspective::IS_CLIENT, perspective_);
     QuicTag tag = QuicVersionToQuicTag(quic_version_);
     writer->WriteUInt32(tag);
     DVLOG(1) << "version = " << quic_version_ << ", tag = '"
-             << QuicUtils::TagToString(tag) << "'";
+             << QuicTagToString(tag) << "'";
   }
 
   if (header.public_header.multipath_flag &&
       !writer->WriteUInt8(header.path_id)) {
     return false;
   }
 
   if (header.public_header.nonce != nullptr &&
       !writer->WriteBytes(header.public_header.nonce,
                           kDiversificationNonceSize)) {
@@ skipping 1480 matching lines @@
 
 bool QuicFramer::RaiseError(QuicErrorCode error) {
   DVLOG(1) << "Error: " << QuicUtils::ErrorToString(error)
            << " detail: " << detailed_error_;
   set_error(error);
   visitor_->OnError(this);
   return false;
 }
 
 }  // namespace net