iwyu: Include stringprintf.h where appropriate, part 3.

net/tools/flip_server/balsa_headers.cc

 // Copyright (c) 2011 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/tools/flip_server/balsa_headers.h"
 
+#include <stdio.h>
 #include <algorithm>
 #include <ext/hash_set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/port.h"
+#include "base/stringprintf.h"
 #include "base/string_piece.h"
-#include "base/string_util.h"
 #include "net/tools/flip_server/balsa_enums.h"
 #include "net/tools/flip_server/buffer_interface.h"
 #include "net/tools/flip_server/simple_buffer.h"
 #include "third_party/tcmalloc/chromium/src/base/googleinit.h"
 // #include "util/gtl/iterator_adaptors-inl.h"
 // #include "util/gtl/map-util.h"
 
 namespace {
 
 const char kContentLength[] = "Content-Length";
@@ skipping 895 matching lines @@
 
 void BalsaHeaders::SetResponseReasonPhrase(const base::StringPiece& reason) {
   // Note: There is no difference between request_version() and
   // response_reason_phrase(). Thus, a function to set one is equivalent to a
   // function to set the other. We maintain two functions for this as it is
   // much more descriptive, and makes code more understandable.
   SetRequestVersion(reason);
 }
 
 }  // namespace net