WebGLRenderer: Removed unused public method.

src/renderers/WebGLRenderer.js

@@ -3240,8 +3240,6 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	};
 
-	this.setMaterialFaces = setMaterialFaces;
-
 	// Textures
 
 	function setTextureParameters ( textureType, texture, isImagePowerOfTwo ) {