Use a direct include of strings headers in rlz/, sandbox/, skia/, sql/, sync/.

sync/util/nigori.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 "sync/util/nigori.h"
 
 #include <sstream>
 #include <vector>
 
 #include "base/base64.h"
 #include "base/logging.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/sys_byteorder.h"
 #include "crypto/encryptor.h"
 #include "crypto/hmac.h"
 #include "crypto/random.h"
 #include "crypto/symmetric_key.h"
 
 using base::Base64Encode;
 using base::Base64Decode;
 using crypto::Encryptor;
 using crypto::HMAC;
@@ skipping 217 matching lines @@
   DCHECK(user_key);
   DCHECK(encryption_key);
   DCHECK(mac_key);
 
   return user_key_->GetRawKey(user_key) &&
       encryption_key_->GetRawKey(encryption_key) &&
       mac_key_->GetRawKey(mac_key);
 }
 
 }  // namespace syncer