Getting html_dart2js and html_dartium a bit more in sync.

tools/dom/templates/html/dart2js/impl_Console.darttemplate

 // 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 $LIBRARYNAME;
 
 $(ANNOTATIONS)class Console {
 
-  static Console safeConsole = new Console();
+  static Console _safeConsole = new Console();
 
   bool get _isConsoleDefined => JS('bool', 'typeof console != "undefined"');
 
   @DomName('Console.memory')
   MemoryInfo get memory => _isConsoleDefined ?
       JS('MemoryInfo', 'console.memory') : null;
 
   @DomName('Console.profiles')
   List<ScriptProfile> get profiles => _isConsoleDefined ?
       JS('List<ScriptProfile>', 'console.profiles') : null;
@@ skipping 52 matching lines @@
 
   @DomName('Console.profileEnd')
   void profileEnd(String title) => _isConsoleDefined ?
       JS('void', 'console.profileEnd(#)', title) : null;
 
   @DomName('Console.time')
   void time(String title) => _isConsoleDefined ?
       JS('void', 'console.time(#)', title) : null;
 
   @DomName('Console.timeEnd')
-  void timeEnd(String timerName) => _isConsoleDefined ?
-      JS('void', 'console.timeEnd(#)', timerName) : null;
+  void timeEnd(String title) => _isConsoleDefined ?
+      JS('void', 'console.timeEnd(#)', title) : null;
 
   @DomName('Console.timeStamp')
   void timeStamp(Object arg) => _isConsoleDefined ?
       JS('void', 'console.timeStamp(#)', arg) : null;
 
   @DomName('Console.trace')
   void trace(Object arg) => _isConsoleDefined ?
       JS('void', 'console.trace(#)', arg) : null;
 
   @DomName('Console.warn')
   void warn(Object arg) => _isConsoleDefined ?
       JS('void', 'console.warn(#)', arg) : null;
 $!MEMBERS
 }