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If an active version of the updater is detected, and it is greater or
equal than the version of the updater running `--install` then the
setup execution path is skipped, and the code proceeds with
installing the app, if needed.

Otherwise, the code sets up the updater, as before.

Bug: 1141037
Change-Id: I95e78c150acba7a5fadca2140cad4a9c22def5c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490543
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819508}