Remove PDF repositories from CT's lua page
Remove PDF repositories from CT's lua page

BUG=skia:

Review-Url: https://codereview.chromium.org/2161753003

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot