GLTFLoader: Remove dependency on 'THREE.DRACOLoader' global

examples/js/loaders/GLTFLoader.js

@@ -496,7 +496,6 @@ THREE.GLTFLoader = ( function () {
 		this.name = EXTENSIONS.KHR_DRACO_MESH_COMPRESSION;
 		this.json = json;
 		this.dracoLoader = dracoLoader;
-		THREE.DRACOLoader.getDecoderModule();
 
 	}