Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartClass.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartClass.java b/compiler/java/com/google/dart/compiler/ast/DartClass.java
index a8045cd5f28faf9e8983591e28316fd4739cb437..fa21514a87fe844b26fc3e15fa6e14546e6506af 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartClass.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartClass.java
@@ -169,27 +169,7 @@ public class DartClass extends DartDeclaration<DartIdentifier> implements HasSym
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (superclass != null) {
-        superclass = becomeParentOf(v.accept(superclass));
-      }
-      v.acceptWithInsertRemove(this, getMembers());
-      if (getTypeParameters() != null) {
-        v.acceptWithInsertRemove(this, getTypeParameters());
-      }
-      if (getInterfaces() != null) {
-        v.acceptWithInsertRemove(this, getInterfaces());
-      }
-      if (defaultClass != null) {
-        defaultClass = becomeParentOf(v.accept(defaultClass));
-      }
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     visitor.visit(typeParameters);
     if (superclass != null) {
       superclass.accept(visitor);
@@ -202,7 +182,7 @@ public class DartClass extends DartDeclaration<DartIdentifier> implements HasSym
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitClass(this);
   }
 }