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

pkg/dartdoc/lib/src/mirrors/dart2js_mirror.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.
 
 #library('mirrors.dart2js');
 
 #import('dart:io');
 #import('dart:uri');
 
 #import('../../../../../lib/compiler/compiler.dart', prefix: 'diagnostics');
@@ skipping 144 matching lines @@
   return newName;
 }
 
 DiagnosticListener get _diagnosticListener {
   return const Dart2JsDiagnosticListener();
 }
 
 class Dart2JsDiagnosticListener implements DiagnosticListener {
   const Dart2JsDiagnosticListener();
 
-  void cancel([String reason, node, token, instruction, element]) {
+  void cancel(String reason, {node, token, instruction, element}) {
     print(reason);
   }
 
   void log(message) {
     print(message);
   }
 
   void internalError(String message,
                      [Node node, Token token, HInstruction instruction,
                       Element element]) {
@@ skipping 1212 matching lines @@
     if (node !== null) {
       var span = system.compiler.spanFromNode(node, script.uri);
       return new Dart2JsLocation(script, span);
     } else {
       var span = system.compiler.spanFromElement(_variable);
       return new Dart2JsLocation(script, span);
     }
   }
 }