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The flag for the previous window was reset too early before the
incognito session was restored, and that caused the problem of
not migrating incognito sessions


Bug: 1139894
Change-Id: I40384b3f2051a79f18cdd0fc755cc01b402cdd2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499177
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821397}