CodeGen: Update GN list

Include generated files for an IDL enum FileSystemPermissionMode.

Bug: 839389
Change-Id: Ib74f8ed23b7c91b5dbaf852f16226a9ace8c24f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325515Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792607}

third_party/blink/renderer/bindings/generated_in_modules.gni

@@ -812,6 +812,8 @@ generated_enumeration_sources_in_modules = [
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_end_of_stream_error.h",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_fill_light_mode.cc",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_fill_light_mode.h",
+  "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_file_system_permission_mode.cc",
+  "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_file_system_permission_mode.h",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_gamepad_haptic_actuator_type.cc",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_gamepad_haptic_actuator_type.h",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_gamepad_haptic_effect_type.cc",