Not necessarily a software issue, but we do need to fix the lab infra.

Based on @sergeyberezin, we are beginning to run external URL tests again, and the A-lab now has wi-fi, so we should re-enable the wi-fi check.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/30ff548ccb973752c09c345fc773ef8ab9d01ddf

commit 30ff548ccb973752c09c345fc773ef8ab9d01ddf
Author: Shenghua Zhang <shenghuazhang@chromium.org>
Date: Tue Nov 28 22:24:50 2017

[iOS] Re-enable test 'testNetworkConnection' in device_check_egtest.mm

Since we are beginning to run external URL test again, and labs now has
wifi. We need to re-enable the wifi checker test for swarming_cron use.

Bug: 763582
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I261b46c63c63160bfae49590fae9248f5d8ffdab
Reviewed-on: https://chromium-review.googlesource.com/794341
Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Shenghua Zhang <shenghuazhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519867}
[modify] https://crrev.com/30ff548ccb973752c09c345fc773ef8ab9d01ddf/ios/chrome/test/earl_grey/device_check_egtest.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/17810546dc4ca5692af2060225cd6ad1eae1ca34

commit 17810546dc4ca5692af2060225cd6ad1eae1ca34
Author: Sergey Berezin <sergeyberezin@chromium.org>
Date: Wed Nov 29 18:25:04 2017

Revert "[iOS] Re-enable test 'testNetworkConnection' in device_check_egtest.mm"

This reverts commit 30ff548ccb973752c09c345fc773ef8ab9d01ddf.

Reason for revert: A-lab devices still have no internet connectivity, causing them to become "unavailable".

Original change's description:
> [iOS] Re-enable test 'testNetworkConnection' in device_check_egtest.mm
> 
> Since we are beginning to run external URL test again, and labs now has
> wifi. We need to re-enable the wifi checker test for swarming_cron use.
> 
> Bug: 763582
> Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
> Change-Id: I261b46c63c63160bfae49590fae9248f5d8ffdab
> Reviewed-on: https://chromium-review.googlesource.com/794341
> Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
> Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
> Commit-Queue: Shenghua Zhang <shenghuazhang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#519867}

TBR=sergeyberezin@chromium.org,baxley@chromium.org,liaoyuke@chromium.org,huangml@chromium.org,shenghuazhang@chromium.org

Change-Id: I13642410635d4abf7cc91d3539d6a06236317370
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 763582
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/797490
Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
Commit-Queue: Sergey Berezin <sergeyberezin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520169}
[modify] https://crrev.com/17810546dc4ca5692af2060225cd6ad1eae1ca34/ios/chrome/test/earl_grey/device_check_egtest.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6c40391fcc5347d26d9b54be672052f8796b4c31

commit 6c40391fcc5347d26d9b54be672052f8796b4c31
Author: Shenghua Zhang <shenghuazhang@chromium.org>
Date: Tue Dec 05 19:41:16 2017

Reland "[iOS] Re-enable test 'testNetworkConnection' in device_check_egtest.mm"

This is a reland of 30ff548ccb973752c09c345fc773ef8ab9d01ddf
Original change's description:
> [iOS] Re-enable test 'testNetworkConnection' in device_check_egtest.mm
> 
> Since we are beginning to run external URL test again, and labs now has
> wifi. We need to re-enable the wifi checker test for swarming_cron use.
> 
> Bug: 763582
> Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
> Change-Id: I261b46c63c63160bfae49590fae9248f5d8ffdab
> Reviewed-on: https://chromium-review.googlesource.com/794341
> Reviewed-by: Sergey Berezin <sergeyberezin@chromium.org>
> Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
> Commit-Queue: Shenghua Zhang <shenghuazhang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#519867}

Bug: 763582
Change-Id: I2bdf2a0903cf2f6c7307341f8570f80abf394ea5
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/809406
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Shenghua Zhang <shenghuazhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521789}
[modify] https://crrev.com/6c40391fcc5347d26d9b54be672052f8796b4c31/ios/chrome/test/earl_grey/device_check_egtest.mm

Moved all Infra>Client>iOS bugs to Infra>Client>Chrome + OS-iOS.