Be lenient with exclusions in PYAUTO_TESTS file
Be lenient with exclusions in PYAUTO_TESTS file

If you try to exclude a test that hasn't been included, pyauto will complain
and it won't run anything.  Sometimes it's harder to add exclusions per
platform, and it'd be easier to ignore tests that need to be excluded but
haven't been included.

Review URL: http://codereview.chromium.org/5913003

git-svn-id: http://src.chromium.org/svn/trunk/src@69494 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 60a9d88e85d8af6c82151121708f2a6df974d48a
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser