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This change updates a couple of strings in the reset process to match
suggestions from UX team.

TBR=dbeam@chromium.org

Bug: 960766
Change-Id: I6c908f31e5241725de936724480dbac864f3132c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610575
Commit-Queue: Martin Kreichgauer <martinkr@google.com>
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#659241}