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This adds checks for unconfigured or non-activated networks to internet_details.js since it no longer uses the checks in network_connect.cc.
It also moves some notification handling from network_connect.cc to network_state_notifier.cc so that it does not rely on network_connect.cc.

Original CL (reverted for unrelated failure):
https://codereview.chromium.org/1043343002/

BUG=430115
TBR=michaelpg, pneubeck, mpearson@chromium.org

Review URL: https://codereview.chromium.org/1091043002

Cr-Commit-Position: refs/heads/master@{#325484}