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This reverts commit 60e867a2.

Reason for revert: this CL breaks ios-simulator-noncq bot

Original change's description:
> [iOS] Updates system colours to use google material colours
>
> This CL replaces the existing system colours by Google material colours.
>
> Bug: 1155472
> Change-Id: Ia9c9e8f31d65fe1db70fd29ad94ca370d0aede07
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595050
> Reviewed-by: Gauthier Ambard <gambard@chromium.org>
> Reviewed-by: Javier Flores <javierrobles@chromium.org>
> Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#840999}

TBR=gambard@chromium.org,javierrobles@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,ewannpv@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1155472
Change-Id: Id0fc2b406f14f385366ed14d80fd704924c61aa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617920Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841460}