Use a direct include of strings headers in chromeos/.

chromeos/system/name_value_pairs_parser.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 "chromeos/system/name_value_pairs_parser.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/process_util.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
 #include "base/strings/string_tokenizer.h"
+#include "base/strings/string_util.h"
 
 namespace chromeos {  // NOLINT
 namespace system {
 
 namespace {
 
 const char kQuoteChars[] = "\"";
 const char kTrimChars[] = "\" ";
 
 bool GetToolOutput(int argc, const char* argv[], std::string& output) {
@@ skipping 115 matching lines @@
   std::string output_string;
   if (!GetToolOutput(argc, argv, output_string))
     return false;
 
   return ParseNameValuePairsWithComments(
       output_string, eq, delim, comment_delim);
 }
 
 }  // namespace system
 }  // namespace chromeos