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Use the sessions AddItem instead of grids AddItem. The former updates
the recent items widget and also |num_items_|. This prevents a DCHECK
from crashing when exiting overview, since |num_items_| will have the
wrong value.

Fixed: 1147990
Test: manual
Change-Id: I27f76a6da28572da6fa9f8bd045b239e63d7d19f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533994Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826836}