GitLab

* Convert NetworkStateListDetailedView to wm common types and add debug name.
* Fix include guards.
* Move files to //ash/common/system/chromeos.
* Fix DEPS.

BUG=619636
TEST=ash_unittests, manual by opening the network (i) info panel and dumping
the window tree with Ctrl-Alt-Shift-W
TBR=derat@chromium.org

Review-Url: https://codereview.chromium.org/2109293002
Cr-Commit-Position: refs/heads/master@{#403301}