Use mojo from the PDF extension instead of using an extension API.

extensions/test/data/api_test_base_unittest.js

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-var test = require('test').binding;
-var unittestBindings = require('test_environment_specific_bindings');
-
-unittestBindings.exportTests([
-  function testEnvironment() {
-    test.assertTrue(!!$Array);
-    test.assertTrue(!!$Function);
-    test.assertTrue(!!$JSON);
-    test.assertTrue(!!$Object);
-    test.assertTrue(!!$RegExp);
-    test.assertTrue(!!$String);
-    test.assertTrue(!!privates);
-    test.assertTrue(!!define);
-    test.assertTrue(!!require);
-    test.assertTrue(!!requireNative);
-    test.assertTrue(!!requireAsync);
-    test.assertEq(undefined, chrome.runtime.lastError);
-    test.assertEq(undefined, chrome.extension.lastError);
-    test.succeed();
-  },
-  function testPromisesRun() {
-    Promise.resolve().then(test.callbackPass());
-  },
-  function testCommonModulesAreAvailable() {
-    var binding = require('binding');
-    var sendRequest = require('sendRequest');
-    var lastError = require('lastError');
-    test.assertTrue(!!binding);
-    test.assertTrue(!!sendRequest);
-    test.assertTrue(!!lastError);
-    test.succeed();
-  },
-  function testMojoModulesAreAvailable() {
-    Promise.all([
-      requireAsync('mojo/public/js/connection'),
-      requireAsync('mojo/public/js/core'),
-      requireAsync('content/public/renderer/frame_interfaces'),
-    ]).then(test.callback(function(modules) {
-      var connection = modules[0];
-      var core = modules[1];
-      var frameInterfaces = modules[2];
-      test.assertTrue(!!connection.Connection);
-      test.assertTrue(!!core.createMessagePipe);
-      test.assertTrue(!!frameInterfaces.getInterface);
-    }));
-  },
-  function testTestBindings() {
-    var counter = 0;
-    function increment() {
-      counter++;
-    }
-    test.runWithUserGesture(increment);
-    test.runWithoutUserGesture(increment);
-    test.runWithNativesEnabled(increment);
-    test.assertEq(3, counter);
-    test.assertFalse(test.isProcessingUserGesture());
-    test.assertTrue(!!test.getApiFeatures());
-    test.assertEq(0, test.getApiDefinitions().length);
-    test.succeed();
-  }
-], test.runTests, exports);