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This was reported as flaky. I am unable to reproduce, which could mean
that the issue is fixed, or it could mean that it only flakes on certain
setups (OS, builds, hardware, etc). To aid investigation I am
speculatively re-enabling it; worst case it gets disabled again.

Bug: 754684
Change-Id: I866679464fce4facde927652751046e062ca1c81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761602Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688531}