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

chrome/browser/chromeos/drive/resource_entry_conversion.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/chromeos/drive/resource_entry_conversion.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/logging.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/google_apis/drive_api_util.h"
 #include "chrome/browser/google_apis/gdata_wapi_parser.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/escape.h"
 
 namespace drive {
 
@@ skipping 90 matching lines @@
     file_info->set_is_directory(true);
   } else {
     // Some resource entries don't map into files (i.e. sites).
     return ResourceEntry();
   }
 
   return output;
 }
 
 }  // namespace drive