GLTFLoader: Removed unused definitions. See #14505.

Author: mrdoob

examples/js/loaders/GLTFLoader.js

@@ -1016,21 +1016,6 @@ THREE.GLTFLoader = ( function () {
 		10497: THREE.RepeatWrapping
 	};
 
-	var WEBGL_TEXTURE_FORMATS = {
-		6406: THREE.AlphaFormat,
-		6407: THREE.RGBFormat,
-		6408: THREE.RGBAFormat,
-		6409: THREE.LuminanceFormat,
-		6410: THREE.LuminanceAlphaFormat
-	};
-
-	var WEBGL_TEXTURE_DATATYPES = {
-		5121: THREE.UnsignedByteType,
-		32819: THREE.UnsignedShort4444Type,
-		32820: THREE.UnsignedShort5551Type,
-		33635: THREE.UnsignedShort565Type
-	};
-
 	var WEBGL_SIDES = {
 		1028: THREE.BackSide, // Culling front
 		1029: THREE.FrontSide // Culling back