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Previously scrollbars always appeared light, even if a WebUI
page was otherwise respecting dark mode. The upcoming
FormControlsDarkMode feature allows webpages to specify whether
scrollbras should follow the system's theme, by specifying a new
<meta name="color-scheme"> tag.

In this CL updating WebUIs that do support dark mode, except for
chrome://new-tab-page which needs to be investigated separately
(styling breaks when the meta tag is added).

Launch Chrome with the following flags to experience dark scrollbars.
--enable-features=WebUIDarkMode,CSSColorSchemeUARendering \
--force-dark-mode

Bug: 1142291
Change-Id: Ia2cece4b18c4f1c1453ce5dad7815881104fa1eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509690
Auto-Submit: dpapad <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822845}