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There is a pre-installed Youtube app that is a hosted app (and not a
bookmark app), but it is hard coded as a bookmark app. To add to this
weirdness, the app id is not the hash of the start url, so this causes
problems within the bookmark app system which assumes this.

This CL fixes the default app configuration, and adds migration code to
fix this for all installs.

R=alancutter@chromium.org, loyso@chromium.org

Bug: 1068453
Fixed: 1084848, 1078450
Change-Id: I7fab1714edede1fbf4030beb55c118b8300f4ebb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2181827
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Auto-Submit: Daniel Murphy <dmurph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770951}