Remove AddOnStateChangedCallback from HTTP server Implementation should have http server running before creating weave::Device BUG:24267885 Change-Id: Ia53cd3f669eea80120a5e8673fe8e549a2c42ccf Reviewed-on: https://weave-review.googlesource.com/1271 Reviewed-by: Alex Vakulenko <avakulenko@google.com>