Default turning on goaway sessions on ip address change for iOS.

Bug: 846079
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I384116a58acb044453a42dbedc1c9f7d23290640
Reviewed-on: https://chromium-review.googlesource.com/1093311
Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567549}
2 files changed