Rename JS_CURRENT_ISOLATE to JS_CURRENT_ISOLATE_CONTEXT.

dart/tests/compiler/dart2js/class_codegen_test.dart

 // Copyright (c) 2012, 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.
 // Test that parameters keep their names in the output.
 
 import "package:expect/expect.dart";
 import 'compiler_helper.dart';
 import 'parser_helper.dart';
 
 const String TEST_ONE = r"""
@@ skipping 68 matching lines @@
   checkOutput(compileAll(TEST_THREE));
 }
 
 fieldTest() {
   String generated = compileAll(TEST_FOUR);
   Expect.isTrue(generated.contains(r"""B: {"": "A;y,z,x"}"""));
 }
 
 constructor1() {
   String generated = compileAll(TEST_FIVE);
-  Expect.isTrue(generated.contains(r"new $.A(a);"));
+  Expect.isTrue(generated.contains(new RegExp(r"new [$a-z]+\.A\(a\);")));
 }
 
 main() {
   twoClasses();
   subClass();
   fieldTest();
   constructor1();
 }