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This reverts commit c793bf0d.

Reason for revert: suspected of causing consistent failures of MobileSessionShutdownMetricsProviderTest.ProvideHasPossibleExplanationMetric on iphone-device bot.

Original change's description:
> [ios] Add previous session info to synthetic crash report
> 
> The data is retrieved from PreviousSessionInfo singleton and
> includes the following fields:
>  - free_disk_in_kb
>  - memory_warning_in_progress
> 
> Bug: 1103752
> Change-Id: I10e6fe758bfde8ad753cbbd363ab34afc1a52e44
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414784
> Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
> Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
> Auto-Submit: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#808397}

TBR=eugenebut@chromium.org,olivierrobin@chromium.org
Bug: 1103752, 1130551

Change-Id: I372e3efa5e68d3375c9af044ac8bbe2f78125acf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421594Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808867}