GitLab

Add NetworkChangeNotifierFactoryCast to create instance of
NetworkChangeNotifierLinux that ignores interfaces that will not be
used to connect to internet.

BUG=469863
R=gunsch@chromium.org,byungchul@chromium.org,wzhong@chromium.org

Review URL: https://codereview.chromium.org/1137483004

Cr-Commit-Position: refs/heads/master@{#329319}