use urllib.request.urlcleanup() in download_chromium.py
use urllib.request.urlcleanup() in download_chromium.py

Fixed: 1280064
Change-Id: Ie33b6d46ffd0b30ddba73efceec0bbe812df07ae
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3365894
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>
Reviewed-by: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Tim Van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend