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Previously unused themes were uninstalled when no infobars were present.
But now when themes can be reverted ChromeColorsService, counting
infobars is not sufficient for preventing uninstall of necessary themes.

This CL adds ThemeReinstaller class that will update the of number of
existing reinstallers and will call RemoveUnusedThemes when there are
no reinstallers left.

This CL also removes ignore_infobars param from RemoveUnusedThemes as it
is not relevant anymore.


Bug: 985001, 991715
Change-Id: Ia3905ee2d8c5fb238c8d6a380d17ed9d3018e2a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757067Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688367}