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Changed the font color to match that of test of the rest of InfoBar
description, and adjusted padding so that e-mail address is in-line with
the InfoBar description text.

Screenshot in light mode:
https://screenshot.googleplex.com/WvQjfXKKzEasV9e

Screenshot in dark mode:
https://screenshot.googleplex.com/6qGQsoDgHYMafde

Bug: 1152332
Change-Id: Ib5c25e83fac3f7d734bcb35ecfa78c6a15456f53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559714Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Anne Lim <annelim@google.com>
Cr-Commit-Position: refs/heads/master@{#831067}