remove use of deprecatedFutureValue from html5lib

pkg/third_party/html5lib/test/tokenizer_test.dart

 library tokenizer_test;
 
 // Note: mirrors used to match the getattr usage in the original test
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:mirrors';
 import 'package:path/path.dart' as pathos;
 import 'package:unittest/unittest.dart';
 import 'package:html5lib/src/char_encodings.dart';
@@ skipping 15 matching lines @@
 
   List parse(String str) {
     // Note: we need to pass bytes to the tokenizer if we want it to handle BOM.
     var bytes = codepointsToUtf8(toCodepoints(str));
     var tokenizer = new HtmlTokenizer(bytes, encoding: 'utf-8');
     outputTokens = [];
 
     // 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);
     }
 
     while (tokenizer.moveNext()) {
       var token = tokenizer.current;
       switch (token.kind) {
         case TokenKind.characters:
           processCharacters(token);
@@ skipping 213 matching lines @@
         for (var initialState in testInfo["initialStates"]) {
           test(testInfo["description"], () {
             testInfo["initialState"] = camelCase(initialState);
             runTokenizerTest(testInfo);
           });
         }
       }
     });
   }
 }