Use a direct include of strings headers in chromeos/.

chromeos/network/network_event_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 "chromeos/network/network_event_log.h"
 
 #include <list>
 
 #include "base/files/file_path.h"
 #include "base/i18n/time_formatting.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/stringprintf.h"
 #include "base/strings/string_tokenizer.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "net/base/escape.h"
 
 namespace chromeos {
 namespace network_event_log {
 
 namespace {
 
 class NetworkEventLog;
@@ skipping 301 matching lines @@
 
 std::string ValueAsString(const base::Value& value) {
   std::string vstr;
   base::JSONWriter::WriteWithOptions(
       &value, base::JSONWriter::OPTIONS_OMIT_BINARY_VALUES, &vstr);
   return vstr.empty() ? "''" : vstr;
 }
 
 }  // namespace network_event_log
 }  // namespace chromeos