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This reverts commit e7684fe6.

Reason for revert: Break the tests

Original change's description:
> [iOS] Add Overrides provider
> 
> The provider is used to install overrides.
> 
> Bug: 954570
> Change-Id: I89acf24af55f3e657db9f421dec8330abac1e64b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584265
> Reviewed-by: Eugene But <eugenebut@chromium.org>
> Commit-Queue: Gauthier Ambard <gambard@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#654815}

TBR=eugenebut@chromium.org,kkhorimoto@chromium.org,gambard@chromium.org

Change-Id: Ia22048bb36549154f8201072be00665ad04c097f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 954570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1587600Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654820}