Use ScopedTaskEnvironment instead of MessageLoopForUI in components tests.

components/sync_sessions/favicon_cache_unittest.cc

 // Copyright 2013 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 "components/sync_sessions/favicon_cache.h"
 
 #include "base/memory/ptr_util.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/time/time.h"
 #include "components/sync/model/attachments/attachment_id.h"
 #include "components/sync/model/attachments/attachment_service_proxy_for_test.h"
 #include "components/sync/model/sync_change_processor_wrapper_for_test.h"
 #include "components/sync/model/sync_error_factory_mock.h"
 #include "components/sync/model/time.h"
 #include "components/sync/protocol/favicon_image_specifics.pb.h"
 #include "components/sync/protocol/favicon_tracking_specifics.pb.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 262 matching lines @@
   void OnCustomFaviconDataAvailable(const TestFaviconData& test_data);
 
   // Helper method to run the message loop after invoking
   // OnReceivedSyncFavicon, which posts an internal task.
   void TriggerSyncFaviconReceived(const GURL& page_url,
                                   const GURL& icon_url,
                                   const std::string& icon_bytes,
                                   int64_t last_visit_time_ms);
 
  private:
-  base::MessageLoopForUI message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   FaviconCache cache_;
 
   // Our dummy ChangeProcessor used to inspect changes pushed to Sync.
   std::unique_ptr<TestChangeProcessor> sync_processor_;
   std::unique_ptr<syncer::SyncChangeProcessorWrapperForTest>
       sync_processor_wrapper_;
 };
 
 SyncFaviconCacheTest::SyncFaviconCacheTest()
-    : cache_(nullptr, nullptr, kMaxSyncFavicons),
+    : scoped_task_environment_(
+          base::test::ScopedTaskEnvironment::MainThreadType::UI),
+      cache_(nullptr, nullptr, kMaxSyncFavicons),
       sync_processor_(new TestChangeProcessor),
       sync_processor_wrapper_(new syncer::SyncChangeProcessorWrapperForTest(
           sync_processor_.get())) {}
 
 void SyncFaviconCacheTest::SetUpInitialSync(
     const syncer::SyncDataList& initial_image_data,
     const syncer::SyncDataList& initial_tracking_data) {
   cache()->MergeDataAndStartSyncing(syncer::FAVICON_IMAGES,
                                     initial_image_data,
                                     CreateAndPassProcessor(),
@@ skipping 1609 matching lines @@
   EXPECT_EQ(changes[4].change_type(), syncer::SyncChange::ACTION_ADD);
   EXPECT_EQ(changes[4].sync_data().GetDataType(), syncer::FAVICON_TRACKING);
   EXPECT_EQ(kMaxSyncFavicons, GetFaviconId(changes[4]));
   // Expire tracking for favicon[0].
   EXPECT_EQ(changes[5].change_type(), syncer::SyncChange::ACTION_DELETE);
   EXPECT_EQ(changes[5].sync_data().GetDataType(), syncer::FAVICON_TRACKING);
   EXPECT_EQ(0, GetFaviconId(changes[5]));
 }
 
 }  // namespace sync_sessions