GitLab

NetworkListDelegate was introduced when parts of network UI were living
in a different component. Now that everything is in //ash/system/network
there is no need for the delegate. NetworkListView and VPNListView can
access its methods directly from NetworkStateListDetailedView. Also,
some of the functionality was only used in NetworkListView and moved to
that class.

This is the first step to clean up code for network and VPN detailed
views necessary to share code between all detailed views.

BUG=686343
TEST=none

Review-Url: https://codereview.chromium.org/2843163003
Cr-Commit-Position: refs/heads/master@{#468227}