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After web time limit is reached, uninstalling a web app
will lead AppService to notify ChildUserService to
resume web activity for the app.

This cl ensures that ChildUserService only pauses or
resumes web time limit if the app is chrome.

Bug: 1072035
Change-Id: Idf8250bf96c8b0717fe78af9b73e1d802e87723a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2154494Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760578}