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Previously incognito tabs were always recovered no matter how the app
was last shutdown.

Instead, do not restore the incognito tabs if the user explicitly closes
Chrome. If the system terminates the app, the tabs should be restored.
(This can happen at any time and without user notice, so such
terminations should not lead to a loss of the user's incognito tabs.)

Bug: 653248
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I018cdf5cda2004e32e1010c4d9bab4bd10c0ae99
Reviewed-on: https://chromium-review.googlesource.com/835532Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526099}