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

webkit/browser/fileapi/sandbox_directory_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_directory_database.h"
 
 #include <math.h>
 #include <algorithm>
 #include <set>
 #include <stack>
 
 #include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/location.h"
 #include "base/metrics/histogram.h"
 #include "base/pickle.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "third_party/leveldatabase/src/include/leveldb/db.h"
 #include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
 #include "webkit/browser/fileapi/file_system_usage_cache.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace {
 
 bool PickleFromFileInfo(
     const fileapi::SandboxDirectoryDatabase::FileInfo& info,
     Pickle* pickle) {
@@ skipping 887 matching lines @@
 
 void SandboxDirectoryDatabase::HandleError(
     const tracked_objects::Location& from_here,
     const leveldb::Status& status) {
   LOG(ERROR) << "SandboxDirectoryDatabase failed at: "
              << from_here.ToString() << " with error: " << status.ToString();
   db_.reset();
 }
 
 }  // namespace fileapi