tree ab7f3b59523dcc0115f913c49cdecc307655fdb2
parent ae523721e462a52f575155147e9dd672f12f405e
author David Worsham <dworsham@google.com> 1554749678 -0700
committer David Worsham <dworsham@google.com> 1554825622 -0700

[scenic] Remove dead ViewManager refs

None of these are in use anymore now that flutter has migrated off of
ViewManager.

SCN-901 #comment

Change-Id: I0547ddffad0056d2b3af5d2aa34b654ecd8daa32