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This fixes a problem when the StoreKit is dismissed, the URL stays on the omni box.
Where it should be reverted to the last item.

Bug: 842725
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I2c645289209d0ae03b09d60e9b90d42565bca057
Reviewed-on: https://chromium-review.googlesource.com/1060346Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559333}