Use ScopedTaskEnvironment instead of MessageLoopForUI in chrome tests.

chrome/browser/password_manager/native_backend_libsecret_unittest.cc

 // Copyright (c) 2015 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 <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chrome/browser/password_manager/native_backend_libsecret.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/autofill/core/common/password_form.h"
 #include "components/password_manager/core/browser/psl_matching_helper.h"
 #include "components/password_manager/core/common/password_manager_pref_names.h"
 #include "components/prefs/pref_service.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 239 matching lines @@
  protected:
   enum UpdateType {  // Used in CheckPSLUpdate().
     UPDATE_BY_UPDATELOGIN,
     UPDATE_BY_ADDLOGIN,
   };
   enum RemoveBetweenMethod {  // Used in CheckRemoveLoginsBetween().
     CREATED,
     SYNCED,
   };
 
-  NativeBackendLibsecretTest() {}
+  NativeBackendLibsecretTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
 
   void SetUp() override {
     ASSERT_FALSE(global_mock_libsecret_items);
     global_mock_libsecret_items = &mock_libsecret_items_;
 
     ASSERT_TRUE(MockLibsecretLoader::LoadMockLibsecret());
 
     form_google_.origin = GURL("http://www.google.com/");
     form_google_.action = GURL("http://www.google.com/login");
     form_google_.username_element = UTF8ToUTF16("user");
@@ skipping 304 matching lines @@
     expected_changes.push_back(
         PasswordStoreChange(PasswordStoreChange::REMOVE, form_isc_));
 
     EXPECT_TRUE(base::Bind(method, base::Unretained(&backend), next_day,
                            base::Time(), &changes).Run());
     CheckPasswordChanges(expected_changes, changes);
 
     EXPECT_TRUE(global_mock_libsecret_items->empty());
   }
 
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 
   // Provide some test forms to avoid having to set them up in each test.
   PasswordForm form_google_;
   PasswordForm form_facebook_;
   PasswordForm form_isc_;
   PasswordForm other_auth_;
 
   std::vector<std::unique_ptr<MockSecretItem>> mock_libsecret_items_;
 };
 
@@ skipping 402 matching lines @@
   EXPECT_EQ(form_google_, *form_list[0]);
 
   EXPECT_EQ(1u, global_mock_libsecret_items->size());
   if (!global_mock_libsecret_items->empty()) {
     CheckMockSecretItem((*global_mock_libsecret_items)[0].get(), form_google_,
                         "chrome-42");
   }
 }
 
 // TODO(mdm): add more basic tests here at some point.