Use a direct include of strings headers in chrome/browser/i*/.

chrome/browser/internal_auth.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 "chrome/browser/internal_auth.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/base64.h"
 #include "base/lazy_instance.h"
 #include "base/rand_util.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "crypto/hmac.h"
 
 namespace {
 
 typedef std::map<std::string, std::string> VarValueMap;
 
@@ skipping 442 matching lines @@
     const std::string& domain, const VarValueMap& var_value_map) {
   return g_generation_service.Get().GeneratePassport(domain, var_value_map, 0);
 }
 
 // static
 void InternalAuthGeneration::GenerateNewKey() {
   g_generation_service.Get().GenerateNewKey();
 }
 
 }  // namespace chrome