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This CL makes the toolbar bg color in the sign-in flow react to theme
changes (so that the button color stays in sync with the toolbar color).

It also removes a few obsolete TODOs.

Bug: 1126913
Change-Id: Ia01207d4544baed1587e7c1030e9319c553c9be9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627160
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843500}