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Removed IDS_CRITICAL_NOTIFICATION_RESTART; use IDS_CANCEL instead.
Reworded IDS_CRITICAL_NOTIFICATION_TEXT content per referenced bug.

TBR=cpu@chromium.org

Bug: 763227
Change-Id: Ie8bf0157da2a62f0e1d32807b9b5ea022d02bd49
Reviewed-on: https://chromium-review.googlesource.com/c/938186Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610166}