Speculatively re-enable many flaky tests to see if they're still flaky.

Bug: 870861
Change-Id: I8f5f47a2f87256ea3edf764ad5acedc287566d8b
TBR: palmer
Reviewed-on: https://chromium-review.googlesource.com/1172074
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582468}
5 files changed