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The previous failures were just because the test is slow. The runs have
been green since it was marked slow.

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests%20(with%20patch)&tests=http%2Ftests%2Fdevtools%2Flayers%2Flayer-compositing-reasons.js
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=http%2Ftests%2Fdevtools%2Flayers%2Flayer-compositing-reasons.js

TBR=wangxianzhu@chromium.org

Bug: 859169
Change-Id: I3e798d06da032b0570d0b1f0cd0003153891b869
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042529
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739150}