Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartMapLiteralEntry.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartMapLiteralEntry.java b/compiler/java/com/google/dart/compiler/ast/DartMapLiteralEntry.java
index e913bad381becae421ab8a2cc6716aa3f608f000..fc0b86b5fb9f5f95b7c8541d2f184af43376c67f 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartMapLiteralEntry.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartMapLiteralEntry.java
@@ -26,22 +26,13 @@ public class DartMapLiteralEntry extends DartNode {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      key = becomeParentOf(v.accept(key));
-      value = becomeParentOf(v.accept(value));
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     key.accept(visitor);
     value.accept(visitor);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitMapLiteralEntry(this);
   }
 }