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This CL moves the filtering of apps by:
 - feature_name
 - user_type,
 - disable_if_arc_supported
 - disable_if_tablet_form_factor
from ParseConfig() into PostProcessConfigs().
This is to be able to share that logic with apps added to
GetPreinstalledWebApps().

There are no behavioural changes in this CL aside from minor fixups
in ExternalInstallOptions::operator==() and its operator<<().

Bug: 1058265
Change-Id: I6a2f3d89f076269e612d0806fb9e3abd37536d24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2520559
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825264}