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ManifestUpdateManager and ManifestUpdateTask are not used outside of
web_applications and are not isolated components, they should live one
level up while maintaining independence from the BMO/Extension backend.

This CL is in preparation to add a dependency from
ManifestUpdateManager to SystemWebAppManager.

Bug: 1035242
Change-Id: I3a5e8e691079619e5b063ac90653dcae6ee3f76f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1973441
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733898}