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This change makes the merge script remove the results file for bad
shards. This should make the rest of the pipeline properly treat those
shards as missing and retry them if appropriate.

R=liaoyuke,martiniss

Bug: 955012
Change-Id: I4bddc82fe1219b68adeb11d76a299962dddf65c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719265
Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682934}