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This test verifies that migration will be timed out after kWaitTimeForNewNetworkSecs and closes the connection if there's no network available.

Bug: 818259, 843299
Change-Id: I58e4945d84e153f621187a1b1b46ac9dbb4e3372
Reviewed-on: https://chromium-review.googlesource.com/1107106
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568634}