Extract external file systems handling from isolated context.

webkit/fileapi/webkit_fileapi.gypi

 # 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.
 
 {
   'variables': {
     'webkit_fileapi_sources': [
+      '../fileapi/external_mount_points.cc',
+      '../fileapi/external_mount_points.h',
       '../fileapi/file_observers.h',
       '../fileapi/file_stream_writer.h',
       '../fileapi/file_system_callback_dispatcher.cc',
       '../fileapi/file_system_callback_dispatcher.h',
       '../fileapi/file_system_context.cc',
       '../fileapi/file_system_context.h',
       '../fileapi/file_system_dir_url_request_job.cc',
       '../fileapi/file_system_dir_url_request_job.h',
       '../fileapi/file_system_directory_database.cc',
       '../fileapi/file_system_directory_database.h',
@@ skipping 43 matching lines @@
       '../fileapi/local_file_system_operation.h',
       '../fileapi/local_file_util.cc',
       '../fileapi/local_file_util.h',
       '../fileapi/media/filtering_file_enumerator.cc',
       '../fileapi/media/filtering_file_enumerator.h',
       '../fileapi/media/media_path_filter.cc',
       '../fileapi/media/media_path_filter.h',
       '../fileapi/media/mtp_device_file_system_config.h',
       '../fileapi/media/native_media_file_util.cc',
       '../fileapi/media/native_media_file_util.h',
+      '../fileapi/mount_points.cc',
+      '../fileapi/mount_points.h',
       '../fileapi/native_file_util.cc',
       '../fileapi/native_file_util.h',
       '../fileapi/obfuscated_file_util.cc',
       '../fileapi/obfuscated_file_util.h',
+      '../fileapi/remote_file_system_proxy.h',
       '../fileapi/sandbox_file_stream_writer.cc',
       '../fileapi/sandbox_file_stream_writer.h',
       '../fileapi/sandbox_mount_point_provider.cc',
       '../fileapi/sandbox_mount_point_provider.h',
       '../fileapi/sandbox_quota_observer.cc',
       '../fileapi/sandbox_quota_observer.h',
       '../fileapi/syncable/file_change.cc',
       '../fileapi/syncable/file_change.h',
       '../fileapi/syncable/local_file_change_tracker.cc',
       '../fileapi/syncable/local_file_change_tracker.h',
@@ skipping 24 matching lines @@
     ],
     'webkit_fileapi_chromeos_sources': [
       '../chromeos/fileapi/async_file_stream.h',
       '../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',
       '../chromeos/fileapi/file_util_async.h',
       '../chromeos/fileapi/remote_file_system_operation.cc',
       '../chromeos/fileapi/remote_file_system_operation.h',
-      '../chromeos/fileapi/remote_file_system_proxy.h',
       '../chromeos/fileapi/remote_file_stream_writer.cc',
       '../chromeos/fileapi/remote_file_stream_writer.h',
     ],
     'webkit_fileapi_media_sources': [
       '../fileapi/media/device_media_file_util.cc',
       '../fileapi/media/device_media_file_util.h',
       '../fileapi/media/mtp_device_delegate.h',
       '../fileapi/media/mtp_device_map_service.cc',
       '../fileapi/media/mtp_device_map_service.h',
     ],
   },
 }