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This CL makes sure that the message sent at the end of the restoration
is only added if a session restoration is in progress. It is also making
sure to remove the script once the restoration is complete.

Fixed: 1127521
Change-Id: Ie70be6a9233c540e6a4c6a05531eb1f5b1b1e206
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463824Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824079}