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This reverts commit e8e69e97.

Reason for revert: causing crbug.com/1070440

Original change's description:
> [iOS] Add WebAppInterface.
> 
> This interface returns the additional standard and secure schemes added
> by web::RegisterWebSchemes() so that these schemes can be used in the
> test process for EG2 tests.
> 
> Bug: none
> Change-Id: Id02340bc11bc725ecc2c9b802455b8d669ec2b5d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144840
> Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
> Auto-Submit: Kurt Horimoto <kkhorimoto@chromium.org>
> Reviewed-by: Eugene But <eugenebut@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#758601}

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

Change-Id: Id05ff8c9b893b48b4e73d3245938d64bbdea8c7f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: none
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2148162Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758659}