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This alerts the user about exporting passwords and allows them to confirm the action or cancel it.

Bug: 789122
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I84af89eae3c5b7004d197826abf1a1f5eccc3bb6
Reviewed-on: https://chromium-review.googlesource.com/817418Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523825}