No other third layer folder in LibWeb has its own namespace which
makes this a special case for the IDLGenerator when determining
namespaces. Instead of adding a special case, simply remove the
namespace.
This extension lets pages query the underlying GPU vendor and renderer
strings via UNMASKED_VENDOR_WEBGL / UNMASKED_RENDERER_WEBGL. Some sites
(e.g. yandex.com/maps) use it to decide whether to render vector tiles
with WebGL or fall back to raster tiles.