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This reverts commit 2dd14e92.

Reason for revert: This changes the meaning of existing code. E.g. the default app installer now calls with require_manifest false and always_update true, instead of require_manifest true.

Original change's description:
> [System PWAs] Make System PWAs update on Chrome launch.
> 
> 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}

TBR=calamity@chromium.org,alancutter@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 836128
Change-Id: I997eed1e5154ee1cc4f40eed55c6d2ffdadb2cf1
Reviewed-on: https://chromium-review.googlesource.com/c/1322185Reviewed-by: Ben Wells <benwells@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606314}