iwyu: Include stringprintf.h where appropriate, part 2.

chrome/test/ui/ui_layout_test.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 "chrome/test/ui/ui_layout_test.h"
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
+#include "base/string_util.h"
 #include "base/test/test_file_util.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "net/base/escape.h"
 #include "net/base/net_util.h"
 
 #if defined(OS_WIN)
 static const char kPlatformName[] = "chromium-win";
@@ skipping 246 matching lines @@
                                       std::string* expected_result_value) {
   FilePath expected_result_path(result_dir_path);
   expected_result_path = expected_result_path.AppendASCII(test_case_file_name);
   expected_result_path = expected_result_path.InsertBeforeExtension(
       FILE_PATH_LITERAL("-expected"));
   expected_result_path =
       expected_result_path.ReplaceExtension(FILE_PATH_LITERAL("txt"));
   return file_util::ReadFileToString(expected_result_path,
                                      expected_result_value);
 }