GitLab

This CL adds unit_tests for ReplacePinnedItem, PinAppAtIndex,
PinnedItemIndexByAppID and a browser_test for the shelf pin update
when an Android app updates to PWA or vice-versa.

BUG=986132

Change-Id: I9b709fc1f9865854873a3f800dab56ba778fd3db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810167
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697844}