Remove QuicUtils::ListTags and use ToDebugString() instead.

net/quic/core/quic_utils.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.
 //
 // Some helpers for quic.
 
 #ifndef NET_QUIC_QUIC_UTILS_H_
 #define NET_QUIC_QUIC_UTILS_H_
 
 #include <stddef.h>
@@ skipping 76 matching lines @@
   // that converts a tag to a string. It will try to maintain the human friendly
   // name if possible (i.e. kABCD -> "ABCD"), or will just treat it as a number
   // if not.
   static std::string TagToString(QuicTag tag);
 
   // Returns the list of QUIC tags represented by the comma separated
   // string in |connection_options|.
   static QuicTagVector ParseQuicConnectionOptions(
       const std::string& connection_options);
 
-  // ListTags prints all of the tags in |tag_map| using TagToString.
-  static std::string ListTags(QuicTagValueMap tag_map);
-
   // Returns PeerAddressChangeType as a std::string.
   static std::string PeerAddressChangeTypeToString(PeerAddressChangeType type);
 
   static char* AsChars(unsigned char* data) {
     return reinterpret_cast<char*>(data);
   }
 
   // Deletes all the sub-frames contained in |frames|.
   static void DeleteFrames(QuicFrames* frames);
 
@@ skipping 44 matching lines @@
 inline QuicIOVector MakeIOVector(base::StringPiece str, struct iovec* iov) {
   iov->iov_base = const_cast<char*>(str.data());
   iov->iov_len = static_cast<size_t>(str.size());
   QuicIOVector quic_iov(iov, 1, str.size());
   return quic_iov;
 }
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_UTILS_H_