Comment 106 for bug 162993

(From update of attachment 292112)
> PR_STATIC_CALLBACK(void)
> IconDecoderModuleDtor(nsIModule* aSelf)
> {
>-#ifdef MOZ_ENABLE_GNOMEUI
> nsIconChannel::Shutdown();
>-#endif
> }

This removal was wrong, as it caused all non-Linux machines to burn due there only being a nsIconChannel::Shutdown() implementation for Linux and not all platforms. I readded the #ifdef but made it check for MOZ_WIDGET_GTK2 instead of MOZ_ENABLE_GNOMEUI.