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net::NetworkChangeNotifier and base::PowerObserver are not hooked to
correct platform code on Mac, thus make background download service not
working correctly.

This CL provides default implementation for device status monitoring on
Mac that always treat the device connected to internet and power source.

This is mostly a temporary solution before platform code is implemented
correctly.

Also pull out BatteryStatusListener and NetworkStatusListener to a
separate file.

Bug: 825878
Change-Id: If34d8eb0cbe5d0575920c4251eda5e5161695adf
Reviewed-on: https://chromium-review.googlesource.com/1178689Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584345}