GitLab

app_shell has updated to move a lot of load and init code into
ExtensionRegistrar

Change-Id: Iaf8b1c4c50dd0a526f7dfc7a0a8aba759f55fe6c
Reviewed-on: https://chromium-review.googlesource.com/941548
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Kevin Schoedel <kpschoedel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542863}