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This change makes PWA-launcher update work for BMO web apps.

Currently, PWA launchers are updated by iterating over the
ExtensionRegistry and filtering to bookmark extensions. Since M85,
BMO is the default, meaning web apps are no longer bookmark apps and
have their own registry: the AppRegistrar.

With this change, PWA-launcher update iterates over apps in the
AppRegistrar.

Bug: 1137573
Change-Id: If30e665eb7999e4e7145fa66bbda31eb98631fb1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514079
Commit-Queue: Jesse McKenna <jessemckenna@google.com>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834620}