Use ScopedTaskEnvironment instead of MessageLoopForUI in components tests.

components/password_manager/core/browser/password_store_unittest.cc

 // Copyright (c) 2012 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.
 
 // The passwords in the tests below are all empty because PasswordStoreDefault
 // does not store the actual passwords on OS X (they are stored in the Keychain
 // instead). We could special-case it, but it is easier to just have empty
 // passwords. This will not be needed anymore if crbug.com/466638 is fixed.
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "components/password_manager/core/browser/affiliated_match_helper.h"
 #include "components/password_manager/core/browser/affiliation_service.h"
 #include "components/password_manager/core/browser/mock_affiliated_match_helper.h"
 #include "components/password_manager/core/browser/password_manager_test_utils.h"
 #include "components/password_manager/core/browser/password_store_consumer.h"
 #include "components/password_manager/core/browser/password_store_default.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 50 matching lines @@
   StartSyncFlareMock() {}
   ~StartSyncFlareMock() {}
 
   MOCK_METHOD1(StartSyncFlare, void(syncer::ModelType));
 };
 
 }  // namespace
 
 class PasswordStoreTest : public testing::Test {
  protected:
+  PasswordStoreTest()
+      : scoped_task_environment_(
+            base::test::ScopedTaskEnvironment::MainThreadType::UI) {}
+
   void SetUp() override { ASSERT_TRUE(temp_dir_.CreateUniqueTempDir()); }
 
   void TearDown() override { ASSERT_TRUE(temp_dir_.Delete()); }
 
   base::FilePath test_login_db_file_path() const {
     return temp_dir_.GetPath().Append(FILE_PATH_LITERAL("login_test"));
   }
 
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   base::ScopedTempDir temp_dir_;
 };
 
 TEST_F(PasswordStoreTest, IgnoreOldWwwGoogleLogins) {
   scoped_refptr<PasswordStoreDefault> store(new PasswordStoreDefault(
       base::ThreadTaskRunnerHandle::Get(), base::ThreadTaskRunnerHandle::Get(),
       base::MakeUnique<LoginDatabase>(test_login_db_file_path())));
   store->Init(syncer::SyncableService::StartSyncFlare());
 
   const time_t cutoff = 1325376000;  // 00:00 Jan 1 2012 UTC
@@ skipping 786 matching lines @@
 
   store->ShutdownOnUIThread();
   base::RunLoop().RunUntilIdle();
 #if defined(OS_MACOSX)
   OSCryptMocker::TearDown();
 #endif
 }
 #endif
 
 }  // namespace password_manager