Change core lib, dart2js, and more for new optional parameters syntax

tests/compiler/dart2js/metadata_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.
 
 #import("dart:uri");
 
 #import('compiler_helper.dart');
 #import('parser_helper.dart');
 
 #import('../../../lib/compiler/implementation/elements/elements.dart');
 #import('../../../lib/compiler/implementation/leg.dart');
 
 void checkAnnotation(String name, String declaration,
-                     [bool isTopLevelOnly = false]) {
+                     {bool isTopLevelOnly: false}) {
   var source;
 
   // Ensure that a compile-time constant can be resolved from an
   // annotation.
   source = """const native = 'xyz';
               @native
               $declaration
               main() {}""";
 
   compileAndCheck(source, name, (compiler, element) {
@@ skipping 92 matching lines @@
 
 void testTopLevelFieldMetadata() {
   checkAnnotation('foo', 'var foo;');
 }
 
 void main() {
   testClassMetadata();
   testTopLevelMethodMetadata();
   testTopLevelFieldMetadata();
 }