Use `Function` as function type syntax.

pkg/compiler/lib/src/js_emitter/full_emitter/nsm_emitter.dart

 // Copyright (c) 2013, 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.
 
 part of dart2js.js_emitter.full_emitter;
 
 class NsmEmitter extends CodeEmitterHelper {
   final List<Selector> trivialNsmHandlers = <Selector>[];
 
   /// If this is true then we can generate the noSuchMethod handlers at startup
   /// time, instead of them being emitted as part of the Object class.
   bool get generateTrivialNsmHandlers => true;
 
   // If we need fewer than this many noSuchMethod handlers we can save space by
   // just emitting them in JS, rather than emitting the JS needed to generate
   // them at run time.
   static const VERY_FEW_NO_SUCH_METHOD_HANDLERS = 10;
 
   static const MAX_MINIFIED_LENGTH_FOR_DIFF_ENCODING = 4;
 
-  void emitNoSuchMethodHandlers(AddPropertyFunction addProperty) {
+  void emitNoSuchMethodHandlers(
+      jsAst.Property Function(jsAst.Name, jsAst.Expression) addProperty) {
     ClassStubGenerator generator =
         new ClassStubGenerator(compiler, namer, backend);
 
     // Keep track of the JavaScript names we've already added so we
     // do not introduce duplicates (bad for code size).
     Map<jsAst.Name, Selector> addedJsNames =
         generator.computeSelectorsForNsmHandlers();
 
     // Set flag used by generateMethod helper below.  If we have very few
     // handlers we use addProperty for them all, rather than try to generate
@@ skipping 355 matching lines @@
   }
 
   String get value {
     if (_cachedValue == null) {
       _cachedValue = _computeDiffEncoding();
     }
 
     return _cachedValue;
   }
 }