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There is no IOThread anymore, and it's really testing browser/net stuff,
so move it in there. The new name is NetworkQualityEstimatorBrowserTest,
since that's what all the tests are checking.

I removed on test for PAC script downloads that are hung during
shutdown, as that's no longer an issue the browser process has to worry
about - that's now a concern just for the NetworkService.

Bug: 934009
Change-Id: Ic7e042c83c767a2ee8674bad12ce3dea53508c21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1730857Reviewed-by: Eric Roman <eroman@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683652}