remove use of deprecatedFutureValue from html5lib

pkg/third_party/html5lib/test/tokenizer_test.dart

Index: pkg/third_party/html5lib/test/tokenizer_test.dart
diff --git a/pkg/third_party/html5lib/test/tokenizer_test.dart b/pkg/third_party/html5lib/test/tokenizer_test.dart
index 637cc9a686e2e21ad60a85d48b3beba0a84f4862..b9e43fedbca338baedf4fd19983b4a79fee64ece 100644
--- a/pkg/third_party/html5lib/test/tokenizer_test.dart
+++ b/pkg/third_party/html5lib/test/tokenizer_test.dart
@@ -33,8 +33,8 @@ class TokenizerTestParser {
     // Note: we can't get a closure of the state method. However, we can
     // create a new closure to invoke it via mirrors.
     var mtok = reflect(tokenizer);
-    tokenizer.state = () => deprecatedFutureValue(
-        mtok.invokeAsync(new Symbol(_state), const [])).reflectee;
+    tokenizer.state = () =>
+        mtok.invoke(new Symbol(_state), const []).reflectee;
 
     if (_lastStartTag != null) {
       tokenizer.currentToken = new StartTagToken(_lastStartTag);