Use type variables on Typedef correctly.

pkg/front_end/lib/src/fasta/source/source_library_builder.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.source_library_builder;
 
 import 'package:front_end/src/scanner/token.dart' show Token;
 
 import 'package:kernel/ast.dart' show ProcedureKind;
 
@@ skipping 225 matching lines @@
       int charOpenParenOffset,
       int charEndOffset,
       String nativeMethodName,
       {bool isTopLevel});
 
   void addEnum(List<MetadataBuilder> metadata, String name,
       List<Object> constantNamesAndOffsets, int charOffset, int charEndOffset);
 
   void addFunctionTypeAlias(
       List<MetadataBuilder> metadata,
-      T returnType,
       String name,
       List<TypeVariableBuilder> typeVariables,
-      List<FormalParameterBuilder> formals,
+      FunctionTypeBuilder type,
       int charOffset);
 
   FunctionTypeBuilder addFunctionType(
       T returnType,
       List<TypeVariableBuilder> typeVariables,
       List<FormalParameterBuilder> formals,
       int charOffset);
 
   void addFactoryMethod(
       List<MetadataBuilder> metadata,
@@ skipping 349 matching lines @@
   /// synthesize type variables on the factory matching the class'.
   void addFactoryDeclaration(
       ProcedureBuilder procedure, DeclarationBuilder<T> factoryDeclaration) {
     factoryDeclarations[procedure] = factoryDeclaration;
   }
 
   Scope toScope(Scope parent) {
     return new Scope(members, setters, parent, isModifiable: false);
   }
 }