Extract external file systems handling from isolated context.

webkit/fileapi/webkit_fileapi.gypi

Index: webkit/fileapi/webkit_fileapi.gypi
diff --git a/webkit/fileapi/webkit_fileapi.gypi b/webkit/fileapi/webkit_fileapi.gypi
index 69162bf329309b30f9f6e772f7fde3885311ae0e..a9b7eccb01da4943225824e14f1864dcaad9eac8 100644
--- a/webkit/fileapi/webkit_fileapi.gypi
+++ b/webkit/fileapi/webkit_fileapi.gypi
@@ -5,6 +5,8 @@
 {
   'variables': {
     'webkit_fileapi_sources': [
+      '../fileapi/external_mount_points.cc',
+      '../fileapi/external_mount_points.h',
       '../fileapi/file_observers.h',
       '../fileapi/file_permission_policy.cc',
       '../fileapi/file_permission_policy.h',
@@ -70,10 +72,13 @@
       '../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',
@@ -118,7 +123,6 @@
       '../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',
     ],