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This is a reland of 6811de35

It was reverted due to crbug.com/988010
The underlying issue was unrelated to that patch and has been fixed in
https://chromium-review.googlesource.com/c/chromium/src/+/1722841

No changes are introduced and hence TBR'ing original reviewers.

Original change's description:
> [PasswordManager] Stop Using Native Backends on Linux systems
>
> Recent migrations moved all users who have been using the keying to the
> LoginDatabase. This CL forces all users to using LoginDatabase
> instead of native backends on Linux.
>
> TBR=pcc@chromium.org
>
> Change-Id: Ibac11e68d8f354ecf7f3c9828d95777ea5b3df60
> Bug: 950269, 950267
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713560
> Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
> Reviewed-by: Peter Collingbourne <pcc@chromium.org>
> Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
> Reviewed-by: Christos Froussios <cfroussios@chromium.org>
> Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#681042}

TBR=cfroussios@chromium.org,vasilii@chromium.org,pcc@chromium.org

Bug: 950269, 950267
Change-Id: I1f091e18f6e23da8a2c8588c9a00bdb08fbda2f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722964Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681798}