Make some parser test helper methods non-static.

pkg/analyzer/test/src/dart/analysis/defined_names_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/analysis/defined_names.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../../generated/parser_test.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(DefinedNamesTest);
   });
 }
 
 @reflectiveTest
-class DefinedNamesTest {
+class DefinedNamesTest extends ParserTestCase {
   test_classMemberNames() {
     DefinedNames names = _computeDefinedNames('''
 class A {
   int a, b;
   A();
   A.c();
   d() {}
   get e => null;
   set f(_) {}
 }
@@ skipping 15 matching lines @@
 get E => null;
 set F(_) {}
 var G, H;
 ''');
     expect(names.topLevelNames,
         unorderedEquals(['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H']));
     expect(names.classMemberNames, isEmpty);
   }
 
   DefinedNames _computeDefinedNames(String code) {
-    CompilationUnit unit = ParserTestCase.parseCompilationUnit2(code);
+    CompilationUnit unit = parseCompilationUnit2(code);
     return computeDefinedNames(unit);
   }
 }