Enable async support

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library engine.parser_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/incremental_scanner.dart';
@@ skipping 3006 matching lines @@
   }
 
   /**
    * Create a parser.
    *
    * @param listener the listener to be passed to the parser
    * @return the parser that was created
    */
   static Parser createParser(GatheringErrorListener listener) {
     Parser parser = new Parser(null, listener);
-    parser.parseAsync = true;
     parser.parseDeferredLibraries = true;
     parser.parseEnum = true;
     return parser;
   }
 
   /**
    * Invoke a method in [Parser]. The method is assumed to have the given number and type of
    * parameters and will be invoked with the given arguments.
    *
    * The given source is scanned and the parser is initialized to start with the first token in the
@@ skipping 16 matching lines @@
     Scanner scanner =
         new Scanner(null, new CharSequenceReader(source), listener);
     Token tokenStream = scanner.tokenize();
     listener.setLineInfo(new TestSource(), scanner.lineStarts);
     //
     // Parse the source.
     //
     Parser parser = createParser(listener);
     parser.parseFunctionBodies = parseFunctionBodies;
     parser.parseDeferredLibraries = true;
-    parser.parseAsync = true;
     Object result =
         invokeParserMethodImpl(parser, methodName, objects, tokenStream);
     //
     // Partially test the results.
     //
     if (!listener.hasErrors) {
       expect(result, isNotNull);
     }
     return result;
   }
@@ skipping 7912 matching lines @@
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser,
         methodName,
         <Object>[tokenStream],
         tokenStream) as Token;
   }
 }