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

extensions/renderer/api_test_base_unittest.cc

-// 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.
-
-#include "extensions/renderer/api_test_base.h"
-
-namespace extensions {
-
-class ApiTestBaseTest : public ApiTestBase {
- public:
-  void SetUp() override { ApiTestBase::SetUp(); }
-};
-
-TEST_F(ApiTestBaseTest, TestEnvironment) {
-  RunTest("api_test_base_unittest.js", "testEnvironment");
-}
-
-TEST_F(ApiTestBaseTest, TestPromisesRun) {
-  RunTest("api_test_base_unittest.js", "testPromisesRun");
-}
-
-TEST_F(ApiTestBaseTest, TestCommonModulesAreAvailable) {
-  RunTest("api_test_base_unittest.js", "testCommonModulesAreAvailable");
-}
-
-TEST_F(ApiTestBaseTest, TestMojoModulesAreAvailable) {
-  RunTest("api_test_base_unittest.js", "testMojoModulesAreAvailable");
-}
-
-TEST_F(ApiTestBaseTest, TestTestBindings) {
-  RunTest("api_test_base_unittest.js", "testTestBindings");
-}
-
-}  // namespace extensions