Add support for the new function-type syntax.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, 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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 139 matching lines @@
     ..asReturn()
     ..asStatement()
     ..asStringInterpolation()
     ..asStringInterpolationPart()
     ..asStringJuxtaposition()
     ..asStringNode()
     ..asSwitchCase()
     ..asSwitchStatement()
     ..asSyncForIn()
     ..asTryStatement()
-    ..asTypeAnnotation()
+    ..asNominalTypeAnnotation()
     ..asTypeVariable()
     ..asTypedef()
     ..asWhile()
     ..asYield();
 }
 
 void useUtil(util.Link link) {
   link.reversePrependAll(link);
   link.copyWithout(link);
   util.longestCommonPrefixLength(null, null);
@@ skipping 138 matching lines @@
   operators.UnaryOperator.fromKind(null);
   operators.BinaryOperator.fromKind(null);
   new semantic_visitor.BulkSendVisitor()..apply(null, null);
   new semantic_visitor.TraversalVisitor(null).apply(null, null);
   new semantic_visitor.BulkDeclarationVisitor().apply(null, null);
 }
 
 useDeferred([deferred.DeferredLoadTask task]) {
   task.dump();
 }