Disable the three sync_integration_tests that fail under tsan and run suite on tsan bot.

Looks like all the protobuf issues went away, maybe due to #612796.

Only some tests still fail:
- TwoClientCustomPassphraseSyncTest.ClientsCanSyncDataWhenScryptEncryptionEnabledInOne
- EnableDisableSingleClientTest.DoesNotRedownloadAfterKeepDataWithStandaloneTransport
- SingleClientDirectorySyncTest.StopThenDisableDeletesDirectory

Disable them under tsan and run the suite on the tsan bot.

Bug: 852002,915219,843511,913704
Change-Id: I862a93a4669c2dbd57ded99c9704528201f687b9
Reviewed-on: https://chromium-review.googlesource.com/c/1377327
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616693}
6 files changed