Delete unused HexDecode method. No behavior change.

net/quic/core/quic_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/core/quic_utils.h"
 
 #include <ctype.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 437 matching lines @@
 }
 
 string QuicUtils::HexEncode(const char* data, size_t length) {
   return HexEncode(StringPiece(data, length));
 }
 
 string QuicUtils::HexEncode(StringPiece data) {
   return ::base::HexEncode(data.data(), data.size());
 }
 
-string QuicUtils::HexDecode(const char* data, size_t length) {
-  return HexDecode(StringPiece(data, length));
-}
-
 string QuicUtils::HexDecode(StringPiece data) {
   if (data.empty())
     return "";
   std::vector<uint8_t> v;
   if (!base::HexStringToBytes(data.as_string(), &v))
     return "";
   string out;
   if (!v.empty())
     out.assign(reinterpret_cast<const char*>(&v[0]), v.size());
   return out;
@@ skipping 25 matching lines @@
 
     bytes_remaining -= line_bytes;
     offset += line_bytes;
     p += line_bytes;
     s += '\n';
   }
   return s;
 }
 
 }  // namespace net