Revert "Add typedef AST node boilerplate."

pkg/kernel/lib/binary/ast_to_binary.dart

Index: pkg/kernel/lib/binary/ast_to_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_to_binary.dart b/pkg/kernel/lib/binary/ast_to_binary.dart
index def8885a42ee5a655427657b47430220e508ab12..f2e47e03bc13d7c89e7494d9fc9413c94323b278 100644
--- a/pkg/kernel/lib/binary/ast_to_binary.dart
+++ b/pkg/kernel/lib/binary/ast_to_binary.dart
@@ -251,7 +251,6 @@ class BinaryPrinter extends Visitor {
     // TODO(jensj): We save (almost) the same URI twice.
     writeUriReference(node.fileUri ?? '');
     writeDeferredImports(node);
-    writeNodeList(node.typedefs);
     writeNodeList(node.classes);
     writeNodeList(node.fields);
     writeNodeList(node.procedures);
@@ -274,15 +273,6 @@ class BinaryPrinter extends Visitor {
     writeStringReference(node.name);
   }
 
-  void visitTypedef(Typedef node) {
-    writeCanonicalNameReference(getCanonicalNameOfTypedef(node));
-    writeOffset(node.fileOffset);
-    writeStringReference(node.name);
-    writeUriReference(node.fileUri ?? '');
-    writeNodeList(node.typeParameters);
-    writeNode(node.type);
-  }
-
   void writeAnnotation(Expression annotation) {
     _variableIndexer ??= new VariableIndexer();
     writeNode(annotation);
@@ -1019,12 +1009,6 @@ class BinaryPrinter extends Visitor {
     writeByte(Tag.VectorType);
   }
 
-  visitTypedefType(TypedefType node) {
-    writeByte(Tag.TypedefType);
-    writeReference(node.typedefReference);
-    writeNodeList(node.typeArguments);
-  }
-
   visitTypeParameter(TypeParameter node) {
     writeStringReference(node.name ?? '');
     writeNode(node.bound);