Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartSwitchStatement.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartSwitchStatement.java b/compiler/java/com/google/dart/compiler/ast/DartSwitchStatement.java
index f2fd75bc2d0b26a2be80865a2a3a3268432e3c65..191df04b8c9d7fe890a35c87ba9175ffe6df72d8 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartSwitchStatement.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartSwitchStatement.java
@@ -28,22 +28,13 @@ public class DartSwitchStatement extends DartStatement {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      expression = becomeParentOf(v.accept(expression));
-      v.acceptWithInsertRemove(this, members);
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     expression.accept(visitor);
     visitor.visit(members);
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitSwitchStatement(this);
   }
 }