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The same script as in https://chromium-review.googlesource.com/654817 was used.

css/README.md cleanup is in https://github.com/w3c/web-platform-tests/pull/8309.

Change-Id: I0019e26cacebc32595e947c52c51d2c34590fc03
Reviewed-on: https://chromium-review.googlesource.com/778862Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517919}