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chrome_style applies styling for an extension's embedded options page.
The styling is old and inconsistent with the modern WebUI appearance.
Since some extensions with many users are still using this flag, support
for it will be phased out in manifest v3

Bug: 973157
Change-Id: I0ae424227bd3a0eda34dc56a5631d9d1a6461464
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298726
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789729}