Add dart:html and friends to patched_dart2js_sdk/platform.dill, also fix up

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 51a2367cd4d0aeec7311a42683656de6680c23d6..76e3a5a1f8952c7eab4951237be7962074899db7 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -43018,9 +43018,9 @@ class _EventStreamSubscription<T extends Event> extends StreamSubscription<T> {
     }
   }
 
-  Future/*<E>*/ asFuture/*<E>*/([var/*=E*/ futureValue]) {
+  Future<E> asFuture<E>([E futureValue]) {
     // We just need a future that will never succeed or fail.
-    var completer = new Completer/*<E>*/();
+    var completer = new Completer<E>();
     return completer.future;
   }
 }