The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/01d76bd10f83504c3767f69faba059139a93e4af

commit 01d76bd10f83504c3767f69faba059139a93e4af
Author: Olivier Robin <olivierrobin@chromium.org>
Date: Fri Jun 15 09:17:48 2018

Implement PowerMonitorDeviceSource::IsOnBatteryPowerImpl on iOS

The NOTIMPLEMENTED is reached at startup.
Implement the method.

Bug:  852369 
Change-Id: I843f7cd7e168a0b4317e030e3f48349ef3cd025c
Reviewed-on: https://chromium-review.googlesource.com/1098965
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567588}
[modify] https://crrev.com/01d76bd10f83504c3767f69faba059139a93e4af/base/power_monitor/power_monitor_device_source_ios.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/043afc5797ba61c80416d85872e1c1faa5e23ad5

commit 043afc5797ba61c80416d85872e1c1faa5e23ad5
Author: Olivier Robin <olivierrobin@chromium.org>
Date: Mon Jun 18 09:54:24 2018

Do not start DnsConfigServiceThread on iOS

DnsConfigService on iOS doesn't watch the config so its result can become
inaccurate at any time.  Disable it to prevent promulgation of inaccurate
DnsConfigs.

https://cs.chromium.org/chromium/src/net/dns/dns_config_service_posix.cc?q=dns_config_service_po&sq=package:chromium&g=0&l=64
shows that this is not implemented on iOS.
Calling the method produces parasite log at startup.

Bug:  852369 
Change-Id: I3d24bcb1089fb3c9099b1fffcb829c2a5a2449dc
Reviewed-on: https://chromium-review.googlesource.com/1102317
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567963}
[modify] https://crrev.com/043afc5797ba61c80416d85872e1c1faa5e23ad5/net/base/network_change_notifier_mac.cc