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Reland "Reenable PredictionManager and HintsFetcher browser tests that were disabled on desktop platforms"

This is a reland of 3bd04812

No changes since this one was reverted incorrectly

Original change's description:
> Reenable PredictionManager and HintsFetcher browser tests that were
> disabled on desktop platforms
>
> Change-Id: I173ac1025760f908042e64c7c8839fb90e41fc78
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626918
> Reviewed-by: Michael Crouse <mcrouse@chromium.org>
> Commit-Queue: Sophie Chang <sophiechang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#843180}

Change-Id: I2bc3449abe44516f018c828c0d91a51101186439
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625959
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Auto-Submit: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843314}