[Sync] Convert DTCs to be not RefCounted and NonThreadSafe.

components/sync/core/test/data_type_error_handler_mock.h

Index: components/sync/core/test/data_type_error_handler_mock.h
diff --git a/components/sync/core/test/data_type_error_handler_mock.h b/components/sync/core/test/data_type_error_handler_mock.h
deleted file mode 100644
index 557240ed7713712bc83de22c9ea6c97230e60f50..0000000000000000000000000000000000000000
--- a/components/sync/core/test/data_type_error_handler_mock.h
+++ /dev/null
@@ -1,38 +0,0 @@
-// 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.
-//
-#ifndef COMPONENTS_SYNC_CORE_TEST_DATA_TYPE_ERROR_HANDLER_MOCK_H__
-#define COMPONENTS_SYNC_CORE_TEST_DATA_TYPE_ERROR_HANDLER_MOCK_H__
-
-#include <string>
-
-#include "components/sync/base/model_type.h"
-#include "components/sync/core/data_type_error_handler.h"
-
-namespace syncer {
-
-// A mock DataTypeErrorHandler for testing. Set the expected error type with
-// ExpectError and OnSingleDataTypeUnrecoverableError will pass. If the error is
-// not called this object's destructor will DCHECK.
-class DataTypeErrorHandlerMock : public DataTypeErrorHandler {
- public:
-  DataTypeErrorHandlerMock();
-  ~DataTypeErrorHandlerMock() override;
-
-  void OnSingleDataTypeUnrecoverableError(const SyncError& error) override;
-  SyncError CreateAndUploadError(const tracked_objects::Location& location,
-                                 const std::string& message,
-                                 ModelType type) override;
-
-  // Set the |error_type| to expect.
-  void ExpectError(SyncError::ErrorType error_type);
-
- private:
-  // The error type to expect.
-  SyncError::ErrorType expected_error_type_ = SyncError::UNSET;
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_CORE_TEST_DATA_TYPE_ERROR_HANDLER_MOCK_H__