[Refactor] to rename and re-layer the file_util stack layers.

webkit/fileapi/webkit_fileapi.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'fileapi',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/net/net.gyp:net',
         '<(DEPTH)/third_party/leveldb/leveldb.gyp:leveldb',
         '<(DEPTH)/webkit/support/webkit_support.gyp:quota',
       ],
       'sources': [
         'file_system_callback_dispatcher.cc',
         'file_system_callback_dispatcher.h',
         'file_system_context.cc',
         'file_system_context.h',
         'file_system_dir_url_request_job.cc',
         'file_system_dir_url_request_job.h',
         'file_system_directory_database.cc',
         'file_system_directory_database.h',
-        'file_system_file_util.cc',
-        'file_system_file_util.h',
         'file_system_file_util_proxy.cc',
         'file_system_file_util_proxy.h',
         'file_system_mount_point_provider.h',
         'file_system_operation.cc',
         'file_system_operation.h',
         'file_system_operation_context.cc',
         'file_system_operation_context.h',
         'file_system_origin_database.cc',
         'file_system_origin_database.h',
         'file_system_path_manager.cc',
         'file_system_path_manager.h',
         'file_system_quota_client.cc',
         'file_system_quota_client.h',
         'file_system_quota_util.cc',
         'file_system_quota_util.h',
         'file_system_types.h',
         'file_system_url_request_job.cc',
         'file_system_url_request_job.h',
         'file_system_url_request_job_factory.cc',
         'file_system_url_request_job_factory.h',
         'file_system_usage_cache.cc',
         'file_system_usage_cache.h',
         'file_system_util.cc',
         'file_system_util.h',
         'file_writer_delegate.cc',
         'file_writer_delegate.h',
-        'local_file_system_file_util.cc',
-        'local_file_system_file_util.h',
-        'obfuscated_file_system_file_util.cc',
-        'obfuscated_file_system_file_util.h',
+        'fileapi_file_util.cc',
+        'fileapi_file_util.h',
+        'local_file_util.cc',
+        'local_file_util.h',
+        'native_file_util.cc',
+        'native_file_util.h',
+        'obfuscated_file_util.cc',
+        'obfuscated_file_util.h',
+        'overlay_file_util.cc',
+        'overlay_file_util.h',
         'quota_file_util.cc',
         'quota_file_util.h',
         'sandbox_mount_point_provider.cc',
         'sandbox_mount_point_provider.h',
         'webfilewriter_base.cc',
         'webfilewriter_base.h',
       ],
       'conditions': [
         ['inside_chromium_build==0', {
           'dependencies': [
             '<(DEPTH)/webkit/support/setup_third_party.gyp:third_party_headers',
           ],
         }],
         ['chromeos==1', {
           'sources': [
             '../chromeos/fileapi/cros_mount_point_provider.cc',
             '../chromeos/fileapi/cros_mount_point_provider.h',
             '../chromeos/fileapi/file_access_permissions.cc',
             '../chromeos/fileapi/file_access_permissions.h',
           ],
         }],
       ],
     },
   ],
 }