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Per UI feedback. We can simply reuse the existing "Advanced" string from
the main settings page, as its string resource description fits the new
use as well.

The previous string is not used anywhere else, and can be removed.

Bug: 1069601
Change-Id: Iba34a77e33b3ad4d7dc4f8abd55d35a684bbf2fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144043Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758045}