Use NodeList where possible.

compiler/java/com/google/dart/compiler/ast/DartMapLiteral.java

Index: compiler/java/com/google/dart/compiler/ast/DartMapLiteral.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartMapLiteral.java b/compiler/java/com/google/dart/compiler/ast/DartMapLiteral.java
index 588301a8217159be02abcf6d88dbd02fad515e1c..40272084f80628017a61219e3cd3ae4dbc07318c 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartMapLiteral.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartMapLiteral.java
@@ -11,12 +11,12 @@ import java.util.List;
  */
 public class DartMapLiteral extends DartTypedLiteral {
 
-  private final List<DartMapLiteralEntry> entries;
+  private final NodeList<DartMapLiteralEntry> entries = NodeList.create(this);
 
   public DartMapLiteral(boolean isConst, List<DartTypeNode> typeArguments,
       List<DartMapLiteralEntry> entries) {
     super(isConst, typeArguments);
-    this.entries = becomeParentOf(entries);
+    this.entries.addAll(entries);
   }
 
   public List<DartMapLiteralEntry> getEntries() {
@@ -26,7 +26,7 @@ public class DartMapLiteral extends DartTypedLiteral {
   @Override
   public void visitChildren(ASTVisitor<?> visitor) {
     super.visitChildren(visitor);
-    visitor.visit(entries);
+    entries.accept(visitor);
   }
 
   @Override