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When an app is pinned on the shelf and that app is updated from Android
app to PWA or from PWA to Android app, the shelf icon now updates to
a shortcut of the new app. This behaviour is fulfilled by the new
ReplacePinnedItem function in the ShelfModel.

BUG=986132

Change-Id: Ib8057c63ea257fc59017e2c906949f6481ac7db6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1781906Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695942}