Further cleanup of element use in type_graph_nodes

pkg/compiler/lib/src/types/dictionary_type_mask.dart

Index: pkg/compiler/lib/src/types/dictionary_type_mask.dart
diff --git a/pkg/compiler/lib/src/types/dictionary_type_mask.dart b/pkg/compiler/lib/src/types/dictionary_type_mask.dart
index 0c4bd8090dcd8f5aff4751a85922a5f576228b93..7784fe1a225f5171950be5f4b764cc16494fe785 100644
--- a/pkg/compiler/lib/src/types/dictionary_type_mask.dart
+++ b/pkg/compiler/lib/src/types/dictionary_type_mask.dart
@@ -16,8 +16,13 @@ class DictionaryTypeMask extends MapTypeMask {
   // The underlying key/value map of this dictionary.
   final Map<String, TypeMask> typeMap;
 
-  DictionaryTypeMask(forwardTo, allocationNode, allocationElement, keyType,
-      valueType, this.typeMap)
+  DictionaryTypeMask(
+      TypeMask forwardTo,
+      Node allocationNode,
+      MemberEntity allocationElement,
+      TypeMask keyType,
+      TypeMask valueType,
+      this.typeMap)
       : super(forwardTo, allocationNode, allocationElement, keyType, valueType);
 
   TypeMask nullable() {