[seed] Implementing the gjs/system gc method

[Alan Knowles <alank src gnome org>]

commit 339ac729b4fe7dc2d16a660b62ae29c050b90367
Author: Danilo Cesar Lemes de Paula <danilo cesar collabora co uk>
Date:   Thu Jan 14 13:54:31 2016 -0200

    Implementing the gjs/system gc method

 modules/gjs/system/seed-system.c |   18 ++++++------------
 1 files changed, 6 insertions(+), 12 deletions(-)
---
diff --git a/modules/gjs/system/seed-system.c b/modules/gjs/system/seed-system.c
index 4e0ff3e..b17aa79 100644
--- a/modules/gjs/system/seed-system.c
+++ b/modules/gjs/system/seed-system.c
@@ -104,18 +104,12 @@ gjs_gc (SeedContext ctx,
                        size_t argumentCount,
                        const SeedValue arguments[], SeedException * exception)
 {
-/*static SeedValue
-gjs_gc(SeedContext context,
-       unsigned   argc,
-       SeedValue      *vp)
-{
-    JS::CallArgs argv = JS::CallArgsFromVp (argc, vp);
-    if (!gjs_parse_call_args(context, "gc", "", argv))
-        return FALSE;
-    JS_GC(JS_GetRuntime(context));
-    argv.rval().set(JSVAL_VOID);
-    return TRUE;*/
-       return seed_value_from_boolean (ctx, TRUE, exception);
+    if (argumentCount != 0) {
+         NUMARG_EXPECTED_EXCEPTION("gc", "0 arguments");
+    }
+
+    seed_context_collect(ctx);
+       return seed_make_undefined (ctx);
 }
 
 static SeedValue