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This reverts commit 2472878c.

The following CL was reverted as a suspect for https://crbug.com/873015:
crrev.com/c/1164876

This CL reverts the revert as the failing test is not related to CSSStyleSheet.
The flaky test has been disabled in crrev.com/c/1171681

Bug: 873015
Change-Id: I54cefa72e4f82b1075550d6efb4a0ca8efe98383
Reviewed-on: https://chromium-review.googlesource.com/1174150
Commit-Queue: Momoko Sumida <momon@google.com>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583191}