Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java b/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
index cdd336d777e5e00f419f640ca6e290621c0737c1..ae54bbc156713fae4002ceddad00337235741002 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartMethodDefinition.java
@@ -65,21 +65,13 @@ public class DartMethodDefinition extends DartClassMember<DartExpression> {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      function = becomeParentOf(v.accept(function));
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     super.visitChildren(visitor);
     function.accept(visitor);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitMethodDefinition(this);
   }
 
@@ -101,16 +93,7 @@ public class DartMethodDefinition extends DartClassMember<DartExpression> {
     }
 
     @Override
-    public void traverse(DartVisitor v, DartContext ctx) {
-      if (v.visit(this, ctx)) {
-        function = becomeParentOf(v.accept(function));
-        v.acceptWithInsertRemove(this, initializers);
-      }
-      v.endVisit(this, ctx);
-    }
-
-    @Override
-    public void visitChildren(DartPlainVisitor<?> visitor) {
+    public void visitChildren(ASTVisitor<?> visitor) {
       super.visitChildren(visitor);
       visitor.visit(initializers);
     }