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This reverts commit 2ba4b0c6.

Reason for revert: new flakiness dashboard results show that the
tests are not actually slow. They are just occasionally stuck.

Original change's description:
> Mark paint/invalidation/window-resize slow
> 
> They occasionally timeout (1/10 ~ 1/20) on the bots, perhaps because of
> the multiple synchronized window resizes.
> 
> Bug: 919789
> Change-Id: I748b7362172b0ac407242e8236ae3ef937384f07
> Reviewed-on: https://chromium-review.googlesource.com/c/1484732
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#634900}

TBR=wangxianzhu@chromium.org,pdr@chromium.org

Change-Id: Ic9d1d868a23f62339e9c965d2a03b49fb2e5b531
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 919789
Reviewed-on: https://chromium-review.googlesource.com/c/1485020Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634943}