Revert "Browser compat for window.requestAnimationFrame"

lib/html/frog/html_frog.dart

Index: lib/html/frog/html_frog.dart
diff --git a/lib/html/frog/html_frog.dart b/lib/html/frog/html_frog.dart
index 8643d501d9e408500912ba3efd5e1720d4c53772..f8d7217e78ce99f46c41db63265b7c795180828a 100644
--- a/lib/html/frog/html_frog.dart
+++ b/lib/html/frog/html_frog.dart
@@ -16256,24 +16256,6 @@ class _WindowImpl extends _EventTargetImpl implements Window native "@*DOMWindow
     _addMeasurementFrameCallback(callback);
   }
 
-  /** @domName DOMWindow.requestAnimationFrame */
-  int requestAnimationFrame(RequestAnimationFrameCallback callback) native '''
-    if (!window.requestAnimationFrame) {
-      window.requestAnimationFrame =
-          window.webkitRequestAnimationFrame ||
-          window.mozRequestAnimationFrame ||
-          window.msRequestAnimationFrame ||
-          window.oRequestAnimationFrame ||
-          function (callback) {
-            window.setTimeout(callback, 16 /* 16ms ~= 60fps */);
-          };
-    }
-    return window.requestAnimationFrame(callback);
-''';
-
-  // Protect member 'requestAnimationFrame'.
-  _requestAnimationFrame() native 'requestAnimationFrame';
-
 
   _WindowEventsImpl get on() =>
     new _WindowEventsImpl(this);
@@ -34346,10 +34328,6 @@ interface Window extends EventTarget {
   void requestLayoutFrame(TimeoutHandler callback);
 
 
-  /** @domName DOMWindow.webkitRequestAnimationFrame */
-  int requestAnimationFrame(RequestAnimationFrameCallback callback);
-
-
   /**
    * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
    */