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This patch gives us the ability to switch between infobar titles, either
with "Sign in as [fullname]" or "Sign in to Chrome", depending on final
UX decisions.

Bug: 1145592
Change-Id: Ifba41e4aa025ec51d80e76ec79015ace375be103
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526061
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825317}