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Session will migrate to the new port after probing succeeds.

BUG: 999285
Change-Id: I115a6a7eede4c027bb666288c1a838a6b1323549
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1775744
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692966}