security: remove context protocol

wire/wp_security_context_manager_v1.txt

@@ -1,8 +0,0 @@
-request destroy (destructor) {
-}
-
-request create_listener {
-    id: id(wp_security_context_v1) (new),
-    listen_fd: fd,
-    close_fd: fd,
-}

wire/wp_security_context_v1.txt

@@ -1,17 +0,0 @@
-request destroy (destructor) {
-}
-
-request set_sandbox_engine {
-    name: str,
-}
-
-request set_app_id {
-    app_id: str,
-}
-
-request set_instance_id {
-    instance_id: str,
-}
-
-request commit {
-}