Fixing TouchEvent.supported

tools/dom/templates/html/impl/impl_TouchEvent.darttemplate

 // Copyright (c) 2013, 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.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   factory $CLASSNAME(TouchList touches, TouchList targetTouches,
@@ skipping 10 matching lines @@
     return e;
   }
 $!MEMBERS
 
   /**
    * Checks if touch events supported on the current platform.
    *
    * Note that touch events are only supported if the user is using a touch
    * device.
    */
-  static bool get supported {
-$if DART2JS
-    if (JS('bool', '"ontouchstart" in window')) {
-      return Device.isEventTypeSupported('TouchEvent');
-    }
-    return false;
-$else
-    // Bug #8186 add equivalent 'ontouchstart' check for Dartium.
-    // Basically, this is a fairly common check and it'd be great if it did not
-    // throw exceptions.
-    return Device.isEventTypeSupported('TouchEvent');
-$endif
-  }
+  static bool get supported => Device.isEventTypeSupported('TouchEvent');
 }