Check in codegen test expectations.

test/codegen/expect/language/function_field_test.js

+dart_library.library('language/function_field_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__function_field_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const function_field_test = Object.create(null);
+  let VoidToint = () => (VoidToint = dart.constFn(dart.definiteFunctionType(core.int, [])))();
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  function_field_test.Wrapper = class Wrapper extends core.Object {
+    new() {
+      this.f = null;
+    }
+  };
+  function_field_test.main = function() {
+    let w = new function_field_test.Wrapper();
+    w.f = dart.fn(() => 42, VoidToint());
+    expect$.Expect.equals(42, dart.dsend(w, 'f'));
+  };
+  dart.fn(function_field_test.main, VoidTodynamic());
+  // Exports:
+  exports.function_field_test = function_field_test;
+});