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Passing this parameter will desotry all the contexts created by the session
upon session disconnect.

Change-Id: I6608ef672b41b922308bf71921a074faa037ae7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042279
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739214}