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

lib/compiler/implementation/js_backend/constant_emitter.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.
 
 class ConstantEmitter implements ConstantVisitor {
   final Compiler compiler;
   final Namer namer;
 
   CodeBuffer buffer;
   bool shouldEmitCanonicalVersion;
@@ skipping 189 matching lines @@
       shouldEmitCanonicalVersion = true;
 
       ClassElement classElement = constant.type.element;
       buffer.add("new ");
       buffer.add(getJsConstructor(classElement));
       buffer.add("(");
       // The arguments of the JavaScript constructor for any given Dart class
       // are in the same order as the members of the class element.
       int emittedArgumentCount = 0;
       classElement.implementation.forEachInstanceField(
-          includeBackendMembers: true,
-          includeSuperMembers: true,
-          f: (ClassElement enclosing, Element field) {
+          (ClassElement enclosing, Element field) {
             if (emittedArgumentCount != 0) buffer.add(", ");
             if (field.name == MapConstant.LENGTH_NAME) {
               buffer.add(constant.keys.entries.length);
             } else if (field.name == MapConstant.JS_OBJECT_NAME) {
               writeJsMap();
             } else if (field.name == MapConstant.KEYS_NAME) {
               emitCanonicalVersionOfConstant(constant.keys, buffer);
             } else if (field.name == MapConstant.PROTO_VALUE) {
               assert(constant.protoValue !== null);
               emitCanonicalVersionOfConstant(constant.protoValue, buffer);
             } else {
               badFieldCountError();
             }
             emittedArgumentCount++;
-          });
+          },
+          includeBackendMembers: true,
+          includeSuperMembers: true);
       if ((constant.protoValue === null && emittedArgumentCount != 3) ||
           (constant.protoValue !== null && emittedArgumentCount != 4)) {
         badFieldCountError();
       }
       buffer.add(")");
     }
   }
 
   void visitConstructed(ConstructedConstant constant) {
     if (shouldEmitCanonicalVersion) {
       emitCanonicalVersion(constant);
     } else {
       shouldEmitCanonicalVersion = true;
 
       buffer.add("new ");
       buffer.add(getJsConstructor(constant.type.element));
       buffer.add("(");
       for (int i = 0; i < constant.fields.length; i++) {
         if (i != 0) buffer.add(", ");
         _visit(constant.fields[i]);
       }
       buffer.add(")");
     }
   }
 }