chore($$raf) Remove support for prefixed requestAnimationFrame

Author: realityking

src/ng/raf.js

@@ -2,21 +2,12 @@
 
 function $$RAFProvider(){ //rAF
   this.$get = ['$window', '$timeout', function($window, $timeout) {
-    var requestAnimationFrame = $window.requestAnimationFrame ||
-                                $window.webkitRequestAnimationFrame ||
-                                $window.mozRequestAnimationFrame;
-
-    var cancelAnimationFrame = $window.cancelAnimationFrame ||
-                               $window.webkitCancelAnimationFrame ||
-                               $window.mozCancelAnimationFrame ||
-                               $window.webkitCancelRequestAnimationFrame;
-
-    var rafSupported = !!requestAnimationFrame;
+    var rafSupported = !!$window.requestAnimationFrame;
     var raf = rafSupported
       ? function(fn) {
-          var id = requestAnimationFrame(fn);
+          var id = $window.requestAnimationFrame(fn);
           return function() {
-            cancelAnimationFrame(id);
+            $window.cancelAnimationFrame(id);
           };
         }
       : function(fn) {