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Update previousSessionInfo to retain the session id in the case of single
window app, then use it on later runs for the first restore of the run.

Bug: 1131031
Change-Id: I3b245826e9a9c40cb6df1d2e9c4123276c8d73f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442231
Commit-Queue: Mark Cogan <marq@chromium.org>
Auto-Submit: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812730}