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This improves chrome://policy page readability.

Screenshot of new chrome://policy page UI:
https://screenshot.googleplex.com/3W4hzapHNNCqttn

Bug: 1121478
Change-Id: Iee2d059d35cc00057bf5f3bfed9fa352ba8a7d1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414257
Commit-Queue: Nikita Podguzov <nikitapodguzov@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807929}