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This reverts commit b050ee2d.

Reason for revert: The test still fails.

Original change's description:
> Re-enable VariationsHttpHeadersBrowserTest tests on ChromeOS.
> 
> I can't reproduce flakes locally, so I'm going to re-enable them and see
> if we've fixed them in the last couple months. I also added additional
> assertions to the test so we'll get more information about why they fail
> if they do.
> 
> Bug: 964338
> Change-Id: I4a864101de6cfb1b434c3b2157d2323d8e6e522a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693704
> Reviewed-by: Eric Roman <eroman@chromium.org>
> Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#675871}

TBR=eroman@chromium.org,rmcelrath@chromium.org

Change-Id: I22e9da1c789c903fe895cfbf45e47a4971b48c83
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 964338
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1696084Reviewed-by: Robbie McElrath <rmcelrath@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676061}