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Background: We update default web apps icons only if user opens
the web app url (DidFinishNavigation, throttled at daily basis).

This new force_reinstall_for_milestone parameter in the external .json
config allows to trigger force reinstall on a particular milestone.

Bug: 1150687
Change-Id: I86956537e933d34ba6746ea3d7fa44dfe5ff1a0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2620921
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842414}