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This reverts commit e39c47e5.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Install app to first available position in app list
> 
> Changes:
> 1. Calculate the first available position in AppListModelUpdater for
>    newly added item.
> 2. Add test coverage.
> 
> Bug: 883939
> Test: AppListSyncableServiceTest.FirstAvailablePosition
> Change-Id: Ibdd2f27455ffd0c76f45906adbc025baab1ff319
> Reviewed-on: https://chromium-review.googlesource.com/1231193
> Commit-Queue: Weidong Guo <weidongg@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#592539}

TBR=xiyuan@chromium.org,stevenjb@chromium.org,weidongg@chromium.org

Change-Id: I03fc07c2f963eb2e569e170d8175a47c7f174fe1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 883939
Reviewed-on: https://chromium-review.googlesource.com/1237144Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592906}