[seed] Implementing the gjs/system clearDateCache method

[Alan Knowles <alank src gnome org>]

commit 0c87961e53352dbee7f5230bca586cbaac1e173b
Author: Danilo Cesar Lemes de Paula <danilo cesar collabora co uk>
Date:   Thu Jan 14 14:23:22 2016 -0200

    Implementing the gjs/system clearDateCache method

 modules/gjs/system/seed-system.c |   23 +++++------------------
 1 files changed, 5 insertions(+), 18 deletions(-)
---
diff --git a/modules/gjs/system/seed-system.c b/modules/gjs/system/seed-system.c
index 8c4c985..a04d575 100644
--- a/modules/gjs/system/seed-system.c
+++ b/modules/gjs/system/seed-system.c
@@ -145,24 +145,11 @@ gjs_clear_date_caches (SeedContext ctx,
                        size_t argumentCount,
                        const SeedValue arguments[], SeedException * exception)
 {
-/*static SeedValue
-gjs_clear_date_caches(SeedContext context,
-             unsigned   argc,
-             SeedValue      *vp)
-{
-    JS::CallReceiver rec = JS::CallReceiverFromVp(vp);
-    JS_BeginRequest(context);
-
-    // Workaround for a bug in SpiderMonkey where tzset is not called before
-    // localtime_r, see https://bugzilla.mozilla.org/show_bug.cgi?id=1004706
-    tzset();
-
-    JS_ClearDateCaches(context);
-    JS_EndRequest(context);
-
-    rec.rval().set(JSVAL_VOID);
-    return TRUE;*/
-       return seed_value_from_boolean (ctx, TRUE, exception);
+    // This is provided just for compatibility as javascriptcore doesn't provide the same
+    // feature.
+    // I'm not even sure that this is needed for webkit.
+    seed_make_exception (ctx, exception, "ImplementationError", "clearDateCache is not implemented.");
+    return seed_make_undefined(ctx);
 }
 
 static seed_static_function module_funcs[] = {