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In the newest shelf redesign, the shelf size changes depending on
whether the user is on the home screen or "in app". To make that work,
we need to have the shelf config observe changes in app list visibility
(from the app list controller). This change makes sure the shelf config
initialization happens after the app list controller is instantiated,
so that the shelf config can add itself as an observer in a future CL.

Bug: 982512
Change-Id: I6889156bf1c5aa06972dbeb304bd468afbadf12e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816819
Auto-Submit: Manu Cornet <manucornet@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698481}