Make helper methods in ParserTestCase non-static.

pkg/analyzer/test/generated/ast_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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.ast_test;
 
 import 'package:analyzer/src/generated/ast.dart';
@@ skipping 504 matching lines @@
     expect(value as double, -42.3);
   }
 
   void test_unary_negated_integer() {
     Object value = _getConstantValue("-42");
     EngineTestCase.assertInstanceOf((obj) => obj is int, int, value);
     expect(value as int, -42);
   }
 
   Object _getConstantValue(String source) =>
-      ParserTestCase.parseExpression(source).accept(new ConstantEvaluator());
+      parseExpression(source).accept(new ConstantEvaluator());
 }
 
 @reflectiveTest
 class ConstructorDeclarationTest extends EngineTestCase {
   void test_firstTokenAfterCommentAndMetadata_all_inverted() {
     Token externalKeyword = TokenFactory.tokenFromKeyword(Keyword.EXTERNAL);
     externalKeyword.offset = 14;
     ConstructorDeclaration declaration = AstFactory.constructorDeclaration2(
         Keyword.CONST, Keyword.FACTORY, AstFactory.identifier3('int'), null,
         null, null, null);
@@ skipping 2703 matching lines @@
   static const List<WrapperKind> values = const [
     PREFIXED_LEFT,
     PREFIXED_RIGHT,
     PROPERTY_LEFT,
     PROPERTY_RIGHT,
     NONE
   ];
 
   const WrapperKind(String name, int ordinal) : super(name, ordinal);
 }