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InlineInstallPrivate seems to have been an experimental API developed
to allow apps to install other apps and extensions. It seems like it was
never launched.

Since regular inline installation is being removed, we should probably remove
this API as well.

Bug: 882045
Change-Id: Iefa97bd46cc38873d1a3d07292d45b2188c8f637
Reviewed-on: https://chromium-review.googlesource.com/c/1265558
Commit-Queue: proberge <proberge@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600877}