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This is a reland of 74640a89

TBR=vasilii@chromium.org

Original change's description:
> [iOS] Make the leak detection backend available on iOS
>
> Bug: 986317
>
> Change-Id: I9d799cd24551f13bc58eac91c843d2da19aa7851
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832267
> Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
> Commit-Queue: Ioana Pandele <ioanap@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#702059}

Bug: 986317
Change-Id: I490b8d96074e1786b74905a083f0554fe914b4c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840771Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Commit-Queue: Ioana Pandele <ioanap@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702835}