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Fix: OnWebAppInstalled must not be called on web app manifest update.

Test added.

This CL fixes the code which is disabled behind
kDesktopPWAsWithoutExtensions flag. No behavior change in ToT.

Bug: 860581
Change-Id: I06673f13b493f4f96aadce7ab8ba4457846210fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2172150
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#765406}