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This reverts commit 95ba7404.

Reason for revert: This change caused  ios_showcase_eg2tests_module failures since https://ci.chromium.org/p/chromium/builders/ci/ios-simulator-noncq/2803.

Original change's description:
> [ios] Remove dependency of Showcase on //ios/chrome/app:app_internal
>
> Showcase should not depend on //ios/chrome/app (except for the hooks).
> The dependencies were unnecessary and can be safely removed (after the
> removal of one stale #include).
>
> After this CL, there is no dependency on //ios/chrome/app:app_internal:
>
>   $ gn path out/Debug-iphonesimulator --all \
>       //ios/showcase:ios_showcase_egtests \
>       //ios/chrome/app:app_internal
>   No non-data paths found between these two targets.
>
> Bug: 870935
> Change-Id: I586fe8da7ce2e74dae2cedfd9720044afa97650f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067264
> Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
> Commit-Queue: edchin <edchin@chromium.org>
> Reviewed-by: edchin <edchin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#744923}

TBR=sdefresne@chromium.org,edchin@chromium.org

Change-Id: I15a0b32382ac1ff8133b99adb9a317e965a8cf86
Bug: 870935
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2079148Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745248}