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telemetry_perf_unittests currently have the largest amount
of overhead (see bug for measurements). It's double that
of the chrome_public_test_apk and content_browsertests.
Dropping 2 of its shards should allow us to add 4 total
new ones which we split between the other two tests.

Bug: 1021686
Change-Id: I953854770fc5fdb8e45ec9541e535f4ada5fc031
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918963Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715807}