Fixed ClearPass.

examples/js/postprocessing/ClearPass.js

@@ -10,7 +10,7 @@ THREE.ClearPass = function () {
 
 };
 
-THREE.ClearPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ),
+THREE.ClearPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {
 
 	constructor: THREE.ClearPass,