Use a direct include of strings headers in webkit/, part 1.

webkit/browser/fileapi/sandbox_origin_database.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 "webkit/browser/fileapi/sandbox_origin_database.h"
 
 #include <set>
 #include <utility>
 
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/format_macros.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace {
 
 const base::FilePath::CharType kOriginDatabaseName[] =
     FILE_PATH_LITERAL("Origins");
 const char kOriginKeyPrefix[] = "ORIGIN:";
 const char kLastPathKey[] = "LAST_PATH";
@@ skipping 300 matching lines @@
       db_->Put(leveldb::WriteOptions(), LastPathKey(), std::string("-1"));
   if (!status.ok()) {
     HandleError(FROM_HERE, status);
     return false;
   }
   *number = -1;
   return true;
 }
 
 }  // namespace fileapi