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This reverts commit 4be5a8c2.

Reason for revert: Breaks lacros builder https://ci.chromium.org/p/chrome/builders/ci/chromeos-amd64-generic-lacros-builder-perf/2124

Original change's description:
> Switch the Linux official build to PGO (from AFDO).
> 
> This switches the Linux official build from AFDO to PGO. This yield some
> 3-4% performance gains on Speedometer and help unifying our desktop
> build configurations, PGO is already used on Win and Mac. The PGO
> profiles for Linux are generated by a continuous bot and are rolled in
> Chrome once or twice per day (AFDO is based on the Android profiles).
> 
> This increases binary size by ~3-4%.
> 
> Bug: 1111437
> Change-Id: I565eb336fa5ad9480e99808ed49246634255b82d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404620
> Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#809040}

TBR=thakis@chromium.org,sebmarchand@chromium.org

Change-Id: I774e6ec7877fd255b117f38898d5c91e7c0e4fc0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1111437
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422253Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809103}