Remove now unused Balsa code.

net/tools/quic/spdy_balsa_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.
-
-#ifndef NET_TOOLS_QUIC_SPDY_BALSA_UTILS_H_
-#define NET_TOOLS_QUIC_SPDY_BALSA_UTILS_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "net/quic/core/quic_protocol.h"
-#include "net/spdy/spdy_framer.h"
-#include "net/spdy/spdy_header_block.h"
-#include "net/spdy/spdy_protocol.h"
-#include "net/tools/balsa/balsa_headers.h"
-
-namespace net {
-
-class SpdyBalsaUtils {
- public:
-  static std::string SerializeResponseHeaders(
-      const BalsaHeaders& response_headers);
-
-  static SpdyHeaderBlock RequestHeadersToSpdyHeaders(
-      const BalsaHeaders& request_headers);
-
-  static SpdyHeaderBlock ResponseHeadersToSpdyHeaders(
-      const BalsaHeaders& response_headers);
-
-  static void SpdyHeadersToResponseHeaders(const SpdyHeaderBlock& block,
-                                           BalsaHeaders* headers);
-
-  static void SpdyHeadersToRequestHeaders(const SpdyHeaderBlock& block,
-                                          BalsaHeaders* headers);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SpdyBalsaUtils);
-};
-
-}  // namespace net
-
-#endif  // NET_TOOLS_QUIC_SPDY_BALSA_UTILS_H_