Add NodeVisitor1 to js_ast

pkg/compiler/lib/src/js/rewrite_async.dart

Index: pkg/compiler/lib/src/js/rewrite_async.dart
diff --git a/pkg/compiler/lib/src/js/rewrite_async.dart b/pkg/compiler/lib/src/js/rewrite_async.dart
index 179a37f4b1d14f444cd169843879d83399b6475e..0f6810d00bc84587b97c7a89a743e96d1e6eb358 100644
--- a/pkg/compiler/lib/src/js/rewrite_async.dart
+++ b/pkg/compiler/lib/src/js/rewrite_async.dart
@@ -363,14 +363,16 @@ abstract class AsyncRewriterBase extends js.NodeVisitor {
   /// If the return value of visiting [node] is an expression guaranteed to have
   /// no side effect, it is dropped.
   void visitExpressionIgnoreResult(js.Expression node) {
-    js.Expression result = node.accept(this);
+    // TODO(28763): Remove `<dynamic>` when issue 28763 is fixed.
+    js.Expression result = node.accept<dynamic>(this);
     if (!(result is js.Literal || result is js.VariableUse)) {
       addExpressionStatement(result);
     }
   }
 
   js.Expression visitExpression(js.Expression node) {
-    return node.accept(this);
+    // TODO(28763): Remove `<dynamic>` when issue 28763 is fixed.
+    return node.accept<dynamic>(this);
   }
 
   /// Calls [fn] with the value of evaluating [node1] and [node2].