Use a direct include of strings headers in chromeos/.

chromeos/network/network_event_log_unittest.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 <algorithm>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/format_macros.h"
-#include "base/stringprintf.h"
 #include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chromeos {
 namespace network_event_log {
 
 namespace {
 
 network_event_log::LogLevel kDefaultLevel = network_event_log::LOG_LEVEL_EVENT;
 
 }  // namespace
@@ skipping 211 matching lines @@
   AddTestEvent(LOG_LEVEL_ERROR, "error3");
   AddTestEvent(LOG_LEVEL_ERROR, "error4");
   AddTestEvent(LOG_LEVEL_EVENT, "event5");
   AddTestEvent(LOG_LEVEL_EVENT, "event6");
   EXPECT_EQ("error3\nerror4\nevent5\nevent6\n", network_event_log::GetAsString(
       OLDEST_FIRST, "", LOG_LEVEL_DEBUG, 0));
 }
 
 }  // namespace network_event_log
 }  // namespace chromeos