prober: Move to using a non-retry client. We actually want to see the failures.
prober: Move to using a non-retry client. We actually want to see the failures.

BUG=skia:

Review URL: https://codereview.chromium.org/1729363002

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