Revert "Add typedef AST node boilerplate."

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index 86503ffa388ef04947663d934bce031e921808d2..9cbc69d92e7c66b9b81334939efdb0e230740717 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -313,10 +313,6 @@ class BinaryBuilder {
     return name?.getReference();
   }
 
-  Reference readTypedefReference() {
-    return readCanonicalNameReference().getReference();
-  }
-
   Name readName() {
     String text = readStringReference();
     if (text.isNotEmpty && text[0] == '_') {
@@ -354,7 +350,6 @@ class BinaryBuilder {
 
     debugPath.add(library.name ?? library.importUri?.toString() ?? 'library');
 
-    _mergeNamedNodeList(library.typedefs, readTypedef, library);
     _mergeNamedNodeList(library.classes, readClass, library);
     _mergeNamedNodeList(library.fields, readField, library);
     _mergeNamedNodeList(library.procedures, readProcedure, library);
@@ -378,29 +373,6 @@ class BinaryBuilder {
     }
   }
 
-  Typedef readTypedef() {
-    var canonicalName = readCanonicalNameReference();
-    var reference = canonicalName.getReference();
-    Typedef node = reference.node;
-    bool shouldWriteData = node == null || _isReadingLibraryImplementation;
-    if (node == null) {
-      node = new Typedef(null, null, reference: reference);
-    }
-    int fileOffset = readOffset();
-    String name = readStringReference();
-    String fileUri = readUriReference();
-    readAndPushTypeParameterList(node.typeParameters, node);
-    var type = readDartType();
-    typeParameterStack.length = 0;
-    if (shouldWriteData) {
-      node.fileOffset = fileOffset;
-      node.name = name;
-      node.fileUri = fileUri;
-      node.type = type;
-    }
-    return node;
-  }
-
   Class readClass() {
     int tag = readByte();
     assert(tag == Tag.Class);
@@ -1047,9 +1019,6 @@ class BinaryBuilder {
   DartType readDartType() {
     int tag = readByte();
     switch (tag) {
-      case Tag.TypedefType:
-        return new TypedefType.byReference(
-            readTypedefReference(), readDartTypeList());
       case Tag.VectorType:
         return const VectorType();
       case Tag.BottomType: