Revert "Installation functionality for Crostini App search"

This reverts commit 4d5a709cfb764af7385456efaec9298ac250c18d.

Reason for revert: Due to refactoring coming from CL:1447912,
we need to update the protos involved, therefore we need to revert
this change so that changes to the proto don't break chrome.

Original change's description:
> Installation functionality for Crostini App search
>
> CL updates the Crostini Repository Search Results in the app launcher
> to install Linux packages when clicked. This contains the relevant
> app launcher and crostini manager changes. This feature is still behind
> a flag and there are plans to incorporate an installation dialogue
> into the installation process.
>
> Bug: 921429
> Change-Id: I17eeb6af488e56be2d9eb34edefb0194975839c8
> Reviewed-on: https://chromium-review.googlesource.com/c/1444901
> Commit-Queue: Daniel Ng <danielng@google.com>
> Reviewed-by: Timothy Loh <timloh@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#628648}

Change-Id: Ia2cecd862b947ee8b6b29b4acaef8b4fccb434fe

TBR=xiyuan@chromium.org

Change-Id: Ia2cecd862b947ee8b6b29b4acaef8b4fccb434fe
Reviewed-on: https://chromium-review.googlesource.com/c/1459864
Commit-Queue: Daniel Ng <danielng@google.com>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630177}
14 files changed