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Also remove |TargetBounds| comparison logic in the shelf layout manager
that isn't used any more, and access some of the shelf components
directly from |Shelf| instead of going through |ShelfWidget|.

This is a step in the direction of better compartmentalizing each
shelf component and better coordinate animations.

Change-Id: If9e4b6dcb17c40988e54db2395271b84922a6167
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032073
Commit-Queue: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737415}