fix cancelRequestAnimationFrame polyfill

src/Three.js

@@ -23,7 +23,7 @@ if ( ! self.Int32Array ) {
     for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
         window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
         window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
-                                   || window[vendors[x]+'RequestCancelAnimationFrame'];
+                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
     }
  
     if (!window.requestAnimationFrame)