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[UIApplication sharedApplication].keyWindow.rootViewController was
used to present UI. Now, the appropriate view controller is
plumbed into autofill to present UI.

Bug: 791793, 692525
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If82b5a5ee37d2ea9778d0332dd6686949d6bbfab
Reviewed-on: https://chromium-review.googlesource.com/882400Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531991}