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AppListView uses AppListViewDelegate::GetShelfSize() to get the shelf
size for calculating:
*   background shield rounded corners.
*   the app list layout.

For both purposes, app list can assume that the shelf height equals
non-in-app height (i.e. assume that in-app shelf is not used).
The former is only used in clamshell mode. For the later, app list will
not be shown with the in-app shelf (at least in static state).

Though, while transitioning from app window to app list (e.g. while
dragging the app window), app list view will be laid out while in-app
shelf shown - if the actual current shelf height is used to calculate
the layout, the app list grid items might jump up once the transition
completes (as the shelf height changes and the app list gets laid out
again with less vertical space available).

This can be avoided if app list view always assumed that the shelf size
equals the non-in-app size, as done in this cl.

BUG=1013706

Change-Id: I5175781baefe1e92cf8abcd92185b1b3fdf8dc19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1857200Reviewed-by: Manu Cornet <manucornet@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713184}