As a slight improvement for making changes on Windows, at least run
the pylint steps. The tests do not currently work with a variety of
failures, but at least running pylint would have caught the regressions
encountered here https://codereview.chromium.org/134313007/#msg19.

R=maruel@chromium.org
BUG=334953

Review URL: https://codereview.chromium.org/137243003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@245420 0039d316-1c4b-4281-b951-d872f2087c98