Revert "Add typedef AST node boilerplate."

runtime/vm/kernel.cc

Index: runtime/vm/kernel.cc
diff --git a/runtime/vm/kernel.cc b/runtime/vm/kernel.cc
index 4ec55e15245656dbce9c2c0ddd7c8fce096b3c06..135609ec0b0b50b39f553ef216f0a57d07d326d7 100644
--- a/runtime/vm/kernel.cc
+++ b/runtime/vm/kernel.cc
@@ -84,20 +84,6 @@ void Library::VisitChildren(Visitor* visitor) {
 }
 
 
-Typedef::~Typedef() {}
-
-
-void Typedef::AcceptTreeVisitor(TreeVisitor* visitor) {
-  visitor->VisitTypedef(this);
-}
-
-
-void Typedef::VisitChildren(Visitor* visitor) {
-  VisitList(&type_parameters(), visitor);
-  type()->AcceptDartTypeVisitor(visitor);
-}
-
-
 Class::~Class() {}
 
 
@@ -1206,19 +1192,6 @@ void InterfaceType::VisitChildren(Visitor* visitor) {
 }
 
 
-TypedefType::~TypedefType() {}
-
-
-void TypedefType::AcceptDartTypeVisitor(DartTypeVisitor* visitor) {
-  visitor->VisitTypedefType(this);
-}
-
-
-void TypedefType::VisitChildren(Visitor* visitor) {
-  VisitList(&type_arguments(), visitor);
-}
-
-
 FunctionType::~FunctionType() {}