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

webkit/common/fileapi/file_system_util.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/common/fileapi/file_system_util.h"
 
 #include <algorithm>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "googleurl/src/gurl.h"
 #include "webkit/base/origin_url_conversions.h"
 
 namespace fileapi {
 
 const char kPersistentDir[] = "/persistent";
 const char kTemporaryDir[] = "/temporary";
 const char kIsolatedDir[] = "/isolated";
@@ skipping 341 matching lines @@
   std::string root = GetFileSystemRootURI(origin_url,
                                           kFileSystemTypeExternal).spec();
   if (base::FilePath::FromUTF8Unsafe(mount_name).ReferencesParent())
     return std::string();
   root.append(mount_name);
   root.append("/");
   return root;
 }
 
 }  // namespace fileapi