Use ASTVisitor as in new AST.

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

Index: compiler/java/com/google/dart/compiler/ast/DartThrowStatement.java
diff --git a/compiler/java/com/google/dart/compiler/ast/DartThrowStatement.java b/compiler/java/com/google/dart/compiler/ast/DartThrowStatement.java
index 61691ba4458aeda7af48ed4cfc9897a665fe3046..4797372252b2de2a340a82dadc66b2bb6daefdb6 100644
--- a/compiler/java/com/google/dart/compiler/ast/DartThrowStatement.java
+++ b/compiler/java/com/google/dart/compiler/ast/DartThrowStatement.java
@@ -25,24 +25,14 @@ public class DartThrowStatement extends DartStatement {
   }
 
   @Override
-  public void traverse(DartVisitor v, DartContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (exception != null) {
-        exception = becomeParentOf(v.accept(exception));
-      }
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public void visitChildren(DartPlainVisitor<?> visitor) {
+  public void visitChildren(ASTVisitor<?> visitor) {
     if (exception != null) {
       exception.accept(visitor);
     }
   }
 
   @Override
-  public <R> R accept(DartPlainVisitor<R> visitor) {
+  public <R> R accept(ASTVisitor<R> visitor) {
     return visitor.visitThrowStatement(this);
   }
 }