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As a temporary measure, make System PWAs update on every Chrome launch.
This allows developers to see changes when they update manifests. This
will be replaced with a lighter, more robust system before consumer
launch.

Bug: 836128
Change-Id: I82febcd9b0f7ae5f8be401bdedbe4846008562f4
Reviewed-on: https://chromium-review.googlesource.com/c/1325595Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607933}