js: fix core.Object, output order, static const fields

lib/src/js/printer.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.
 
 part of js_ast;
 
 
 class JavaScriptPrintingOptions {
   final bool shouldCompressOutput;
   final bool minifyLocalVariables;
@@ skipping 961 matching lines @@
     visit(node.classExpr);
     lineOut();
   }
 
   visitClassExpression(ClassExpression node) {
     out('class ');
     visit(node.name);
     if (node.heritage != null) {
       out(' extends ');
       visit(node.heritage);
-      spaceOut();
     }
+    spaceOut();
     out('{');
     lineOut();
     indentMore();
     for (var method in node.methods) {
       indent();
       visit(method);
       lineOut();
     }
     indentLess();
     indent();
@@ skipping 411 matching lines @@
         codes.add(nthLetter((n ~/ nameSpaceSize) % LETTERS));
       }
       codes.add(charCodes.$0 + digit);
       newName = new String.fromCharCodes(codes);
     }
     assert(new RegExp(r'[a-zA-Z][a-zA-Z0-9]*').hasMatch(newName));
     maps.last[oldName] = newName;
     return newName;
   }
 }