Use ScopedTaskEnvironment instead of MessageLoop in components unit tests.

components/autofill/core/browser/webdata/autocomplete_sync_bridge_unittest.cc

 // Copyright 2016 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/autofill/core/browser/webdata/autocomplete_sync_bridge.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 #include <vector>
 
 #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/stringprintf.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 "components/autofill/core/browser/webdata/autofill_entry.h"
 #include "components/autofill/core/browser/webdata/autofill_table.h"
 #include "components/autofill/core/browser/webdata/autofill_webdata_backend.h"
 #include "components/autofill/core/browser/webdata/autofill_webdata_backend_impl.h"
 #include "components/sync/model/data_batch.h"
 #include "components/sync/model/metadata_batch.h"
 #include "components/sync/model/model_error.h"
 #include "components/sync/model/recording_model_type_change_processor.h"
@@ skipping 240 matching lines @@
   std::unique_ptr<syncer::ModelTypeChangeProcessor>
   CreateModelTypeChangeProcessor(syncer::ModelType type,
                                  syncer::ModelTypeSyncBridge* bridge) {
     auto processor =
         base::MakeUnique<syncer::RecordingModelTypeChangeProcessor>();
     processor_ = processor.get();
     return std::move(processor);
   }
 
   ScopedTempDir temp_dir_;
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   FakeAutofillBackend backend_;
   AutofillTable table_;
   WebDatabase db_;
   std::unique_ptr<AutocompleteSyncBridge> bridge_;
   // A non-owning pointer to the processor given to the bridge. Will be null
   // before being given to the bridge, to make ownership easier.
   syncer::RecordingModelTypeChangeProcessor* processor_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteSyncBridgeTest);
 };
@@ skipping 390 matching lines @@
   VerifyMerge({remote2, specifics3, remote4});
 
   VerifyAllData({local1, remote2, specifics3, merged4});
   EXPECT_EQ(2u, processor()->put_multimap().size());
   VerifyProcessorRecordedPut(local1);
   VerifyProcessorRecordedPut(merged4);
   EXPECT_EQ(0u, processor()->delete_set().size());
 }
 
 }  // namespace autofill