Reify type params on map literals

test/codegen_expected/lib/html/fontface_test.js

 dart_library.library('lib/html/fontface_test', null, /* Imports */[
   'dart_sdk',
   'unittest'
 ], function load__fontface_test(exports, dart_sdk, unittest) {
   'use strict';
   const core = dart_sdk.core;
   const html = dart_sdk.html;
   const dart = dart_sdk.dart;
   const dartx = dart_sdk.dartx;
   const html_config = unittest.html_config;
   const unittest$ = unittest.unittest;
   const src__matcher__expect = unittest.src__matcher__expect;
   const src__matcher__core_matchers = unittest.src__matcher__core_matchers;
   const fontface_test = Object.create(null);
   let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
   fontface_test.main = function() {
     html_config.useHtmlConfiguration();
     unittest$.test("Creation with parameters", dart.fn(() => {
-      let font = html.FontFace.new('Ahem', 'url(Ahem.ttf)', dart.map({variant: 'small-caps'}));
+      let font = html.FontFace.new('Ahem', 'url(Ahem.ttf)', dart.map({variant: 'small-caps'}, core.String, core.String));
       src__matcher__expect.expect(html.FontFace.is(font), src__matcher__core_matchers.isTrue);
       src__matcher__expect.expect(font[dartx.family], 'Ahem');
       src__matcher__expect.expect(font[dartx.variant], 'small-caps');
     }, VoidTodynamic()));
   };
   dart.fn(fontface_test.main, VoidTodynamic());
   // Exports:
   exports.fontface_test = fontface_test;
 });