Strong html

tools/dom/templates/html/impl/impl_Window.darttemplate

Index: tools/dom/templates/html/impl/impl_Window.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Window.darttemplate b/tools/dom/templates/html/impl/impl_Window.darttemplate
index 521fd00227357d460b0a10d295ce5ec148b48add..c9f82796bb954f0b4c9e93e627a53c9e4de1d217 100644
--- a/tools/dom/templates/html/impl/impl_Window.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Window.darttemplate
@@ -115,7 +115,7 @@ $if DART2JS
   @DomName('Window.requestAnimationFrame')
   int requestAnimationFrame(FrameRequestCallback callback) {
     _ensureRequestAnimationFrame();
-    return _requestAnimationFrame(_wrapZone(callback));
+    return _requestAnimationFrame(_wrapZone/*<num, dynamic>*/(callback));
   }
 
   /**
@@ -341,12 +341,11 @@ class _BeforeUnloadEventStreamProvider implements
   Stream<BeforeUnloadEvent> forTarget(EventTarget e, {bool useCapture: false}) {
     var stream = new _EventStream(e, _eventType, useCapture);
 $if DART2JS
-    var controller = new StreamController(sync: true);
+    var controller = new StreamController<BeforeUnloadEvent>(sync: true);
 
     stream.listen((event) {
       var wrapped = new _BeforeUnloadEvent(event);
       controller.add(wrapped);
-      return wrapped.returnValue;
     });
 
     return controller.stream;