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Using --install without using --appid={appid} will now install the
updater without installing any application.

Bug: 1014298
Change-Id: I4f6be0f5188261e75293abb6c939dd759fd01000
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121455
Commit-Queue: S. Ganesh <ganesh@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Auto-Submit: S. Ganesh <ganesh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753749}