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It didn't work by itself. It was just a redundant information of
whether the scrollbar theme supports solid color scrollbars.

Change-Id: I32c61c8337bb8546a05841723833905463e71457
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896675Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712458}