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Implement backward compatibility uninstall of Web Apps via
shadow Bookmark Apps.

On a web app uninstall we also must uninstall the shadow bookmark app.

All uninstall changes for the extensions registry get
propagated to the sync server (syncer::ModelType::APPS) and to all
devices where BMO is disabled.

Design doc: go/chrome-bmo-migration.

This is a re-land of
https://chromium-review.googlesource.com/c/chromium/src/+/2162507

We do only legacy uninstalls in this CL to fix the bug.

Bug: 1020037, 1086909
Change-Id: Ib65edc2762de38f050afedb00ffe06665845431b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228371
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774552}