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Currently, if an app is disabled pending custodian approval, and the
supervised user tries to open it through the launcher, nothing
happens. This CL fixes this behavior by either asking for parent
permission or displaying an error dialog. If the parent has the
"Permissions for sites, apps and extensions" toggle enabled, then
launching the app will ask for parent permission. Otherwise, the user
will see an error dialog.

This CL also refactors some common logic between the ManagementAPI
and ExtensionEnableFlow into the SupervisedUserExtensionsDelegate for
determining which dialog to show when enabling extensions for
supervised users.

Bug: 1079415,1071255
Change-Id: I585238db5e9a9de96849b7a15dda120b13339b68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2238408
Commit-Queue: Toby Huang <tobyhuang@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dan S <danan@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Yilkal Abe <yilkal@chromium.org>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785958}