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This CL sets the final version the title, explanation and button strings
for the password manager onboarding dialog.

Bug: 983445
Change-Id: Ibc265894f04877be5f89676e295fa7a7d6c37cc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1781638Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Andrei Chulkov <achulkov@google.com>
Cr-Commit-Position: refs/heads/master@{#693791}