A recent upstream change contains a trailing space in README.md:
https://github.com/w3c/web-platform-tests/commit/99f333d0822e6788e200b8fae3cb758be99211ff

which leads to presubmit check failures:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.infra.cron%2Fwpt-importer%2F417%2F%2B%2Frecipes%2Fsteps%2FImport_changes_from_WPT_to_Chromium%2F0%2Fstdout


More detailed logs from local run:

Running presubmit commit checks ...
Running /usr/local/google/home/robertma/chromium/src/PRESUBMIT.py
Running /usr/local/google/home/robertma/chromium/src/third_party/PRESUBMIT.py
Running /usr/local/google/home/robertma/chromium/src/third_party/WebKit/PRESUBMIT.py
Running /usr/local/google/home/robertma/chromium/src/third_party/WebKit/LayoutTests/PRESUBMIT.py
Running /usr/local/google/home/robertma/chromium/src/third_party/WebKit/LayoutTests/external/PRESUBMIT.py
Running /usr/local/google/home/robertma/chromium/src/third_party/WebKit/Tools/PRESUBMIT.py

** Presubmit ERRORS **
README.md:18: Whitespace at EOL (TRAILING WHITESPACE)

There was 1 error (TRAILING WHITESPACE: 1)
You must fix all errors; for details on how to fix them, see
http://web-platform-tests.org/writing-tests/lint-tool.html

However, instead of fixing a particular error, it's sometimes
OK to add a line to the lint.whitelist file in the root of the
web-platform-tests directory to make the lint tool ignore it.

For example, to make the lint tool ignore all 'TRAILING WHITESPACE'
errors in the README.md file,
you could add the following line to the lint.whitelist file.

TRAILING WHITESPACE:README.md