Enable tests that are no longer flaky.
Enable tests that are no longer flaky.

Now that we have updated the parallel library to create manager
processes explicitly, we can re-enable a number of tests that were
previously disabled due to flakiness. Do this.

BUG=chromium:323297
TEST=Run the tests a ton of times to look for flakiness.

Change-Id: I119bca7557ba380e5204dd32b5d48286529a111c
Reviewed-on: https://chromium-review.googlesource.com/177975
Reviewed-by: Yu-Ju Hong <52dc720c411f8e2156e608c1a8b894a917489667@chromium.org>
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite