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This reverts commit a4418459.

Reason for revert: Causing crashes (https://bugs.chromium.org/p/chromium/issues/detail?id=1122534 and https://bugs.chromium.org/p/chromium/issues/detail?id=1122732)

Original change's description:
> Move visual feature scoring to helper thread
> 
> This CL calls the GetMatchingVisualTargets in a worker thread, since
> the process of scoring visual features takes longer than expected
> and was blocking interaction.
> 
> Fixed: 1121375
> Change-Id: I8f3e33d20f812645a72adfc16fe33241b49a6ff4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372869
> Commit-Queue: Daniel Rubery <drubery@chromium.org>
> Reviewed-by: Bettina Dea <bdea@chromium.org>
> Reviewed-by: Varun Khaneja <vakh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#801907}

TBR=vakh@chromium.org,bdea@chromium.org,drubery@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I02048f19ab8aee3a39a413b6f3cea1e1c4f696de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2385782Reviewed-by: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803219}