Use a proper closure instead of a 'close your eyes' style closure

tools/dom/src/native_DOMImplementation.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 html;
 
 class _ConsoleVariables {
   Map<String, Object> _data = new Map<String, Object>();
 
   /**
@@ skipping 481 matching lines @@
   Iterable<String> get keys native "DOMStringMap_getKeys_Callback";
   Iterable<String> get values => Maps.getValues(this);
   int get length => Maps.length(this);
   bool get isEmpty => Maps.isEmpty(this);
   bool get isNotEmpty => Maps.isNotEmpty(this);
   void addAll(Map<String, String> other) {
     other.forEach((key, value) => this[key] = value);
   }
 }
 
-final _printClosure = window.console.log;
+final _printClosure = (s) => window.console.log(s);
 final _pureIsolatePrintClosure = (s) {
   throw new UnimplementedError("Printing from a background isolate "
                                "is not supported in the browser");
 };
 
 final _forwardingPrintClosure = _Utils.forwardingPrint;
 
 final _uriBaseClosure = () => Uri.parse(window.location.href);
 
 final _pureIsolateUriBaseClosure = () {
@@ skipping 83 matching lines @@
   _scheduleImmediateHelper._schedule(callback);
 };
 
 get _pureIsolateScheduleImmediateClosure => ((void callback()) =>
   throw new UnimplementedError("scheduleMicrotask in background isolates "
                                "are not supported in the browser"));
 
 void _initializeCustomElement(Element e) {
   _Utils.initializeCustomElement(e);
 }