Remove unneeded code, spotted by Peter.

frog/leg/scanner/listener.dart

Index: frog/leg/scanner/listener.dart
===================================================================
--- frog/leg/scanner/listener.dart	(revision 2373)
+++ frog/leg/scanner/listener.dart	(working copy)
@@ -468,7 +468,8 @@
       names = names.prepend(popNode());
     }
     for (; !names.isEmpty(); names = names.tail) {
-      pushElement(new PartialFieldElement(names.head.source, fields));
+      pushElement(
+          new VariableElement(names.head.source, fields, ElementKind.FIELD));
     }
   }
 
@@ -1023,17 +1024,6 @@
   }
 }
 
-class PartialFieldElement extends VariableElement {
-  PartialFieldElement(SourceString name,
-                      Element variables,
-                      [Element enclosing = null])
-    : super(name, variables, ElementKind.FIELD, enclosing);
-
-  Node parseNode(Canceler canceler, Logger logger) {
-    return variables.parseNode(canceler, logger);
-  }
-}
-
 class PartialFieldListElement extends VariableListElement {
   final Token beginToken;
   final Token endToken;