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Fixes the bug where changes to existing autofill profiles and credit cards
or adding new ones get reflected in PersonalDataManager when user is in
incognito mode.
Also refactors the details of adding/updating autofill profiles and credit
cards into the paymentrequest.mm instead of the coordinators.
Updates the unit tests accordingly.

Bug: 814130
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2cc72032648d162304211fe3de6612bc23848350
Reviewed-on: https://chromium-review.googlesource.com/931625
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539048}