Use a direct include of strings headers in chrome/test/.

chrome/test/chromedriver/chrome/log.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 <stdio.h>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/test/chromedriver/logging.h"
 
 namespace {
 
 // Truncates the given string to 200 characters, adding an ellipsis if
 // truncation was necessary.
 void TruncateString(std::string* data) {
   const size_t kMaxLength = 200;
   if (data->length() > kMaxLength) {
@@ skipping 103 matching lines @@
       base::StringPrintf("[%.3lf][%s]: %s",
                          base::TimeDelta(timestamp - start_).InSecondsF(),
                          level_name,
                          ConvertForDisplay(message).c_str());
   const char* format = "%s\n";
   if (entry[entry.length() - 1] == '\n')
     format = "%s";
   fprintf(stderr, format, entry.c_str());
   fflush(stderr);
 }