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Significantly reduce the workload of ProtoDBPerfTest.

Certain ProtoDBPerfTests still consistently fail on Windows or are
flaky because they take too long.

This CL re-enables the disabled tests on Windows but they should now
take 10% of the time they used to. Tested locally on Linux, the disabled
tests that each took ~20s to finish now take under 2.

The total running time of the entire suite locally was reduced from
390s to 49s.

Bug: 879922
Change-Id: I620e5329c1ffef53b311f3a04524bafa8b749381
Reviewed-on: https://chromium-review.googlesource.com/c/1276772Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Troy Hildebrandt <thildebr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599234}