Delete unused HexDecode method. No behavior change.

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_CORE_QUIC_UTILS_H_
 #define NET_QUIC_CORE_QUIC_UTILS_H_
 
 #include <stddef.h>
@@ skipping 78 matching lines @@
   // Allocates a new char[] of size |packet.encrypted_length| and copies in
   // |packet.encrypted_buffer|.
   static char* CopyBuffer(const SerializedPacket& packet);
 
   // Determines and returns change type of address change from |old_address| to
   // |new_address|.
   static PeerAddressChangeType DetermineAddressChangeType(
       const IPEndPoint& old_address,
       const IPEndPoint& new_address);
 
-  // This converts 'num' bytes of binary to a 2*'num'-character hexadecimal
-  // representation. Return value: 2*'num' characters of ascii std::string.
+  // This converts |length| bytes of binary to a 2*|length|-character
+  // hexadecimal representation.
+  // Return value: 2*|length| characters of ASCII std::string.
   static std::string HexEncode(const char* data, size_t length);
   static std::string HexEncode(base::StringPiece data);
 
-  // This converts 2*'num' hexadecimal characters to 'num' binary data.
-  // Return value: 'num' bytes of binary data (via the 'to' argument).
-  static std::string HexDecode(const char* data, size_t length);
+  // Converts |data| from a hexadecimal ASCII std::string to binary.
   static std::string HexDecode(base::StringPiece data);
 
   // Returns a std::string containing hex and ASCII representations of |binary|,
   // side-by-side in the style of hexdump. Non-printable characters will be
   // printed as '.' in the ASCII output.
   // "0x0000:  4865 6c6c 6f2c 2051 5549 4321 0102 0304  Hello,.QUIC!...."
   static std::string HexDump(base::StringPiece binary_data);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicUtils);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_UTILS_H_