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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: I04e65a4a060a6e91c0f7d32bd44be51492e2fd4e
Reviewed-on: https://chromium-review.googlesource.com/c/1282503
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603800}