Updated grdp exclusions in transifex.py.

Fixes brave/brave-browser#6907

There is no need to exclude os_settings_strings.grdp and
xr_consent_ui_strings.grdp.

media_router_resources.grdp has been removed upstream.

Chromium change:

https://chromium.googlesource.com/chromium/src/+/edcf55b10dfe41c3ffa18bfbca8f07e62532ef74

commit edcf55b10dfe41c3ffa18bfbca8f07e62532ef74
Author: Takumi Fujimoto <takumif@chromium.org>
Date:   Tue Jul 9 16:36:20 2019 +0000

    Delete Media Router WebUI dialog resource files

    Delete JS/HTML/CSS files for chrome://media-router and its tests.

    We do not remove files related to chrome://media-router-internals
    because that is still in use.

    Bug: 900246

script/lib/transifex.py

@@ -229,10 +229,7 @@ def get_grd_message_string_tags(grd_file_path):
  for element in elements:
  grd_base_path = os.path.dirname(grd_file_path)
  grd_part_filename = element.get('file')
- if grd_part_filename in ['chromeos_strings.grdp',
- 'media_router_resources.grdp',
- 'os_settings_strings.grdp',
- 'xr_consent_ui_strings.grdp']:
+ if grd_part_filename in ['chromeos_strings.grdp']:
  continue
  grd_part_path = os.path.join(grd_base_path, grd_part_filename)
  part_output_elements = get_grd_message_string_tags(grd_part_path)