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This CL implements the uninstall method in arc_apps.

BUG=916380

Change-Id: I2ea78604d3eeee68f72f1c5985eb6bc71371090d
Reviewed-on: https://chromium-review.googlesource.com/c/1451497
Commit-Queue: Melissa Zhang <melzhang@google.com>
Reviewed-by: Nigel Tao <nigeltao@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630686}