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

components/sync/api/data_type_error_handler_mock.cc

Index: components/sync/api/data_type_error_handler_mock.cc
diff --git a/components/sync/core_impl/test/data_type_error_handler_mock.cc b/components/sync/api/data_type_error_handler_mock.cc
similarity index 80%
rename from components/sync/core_impl/test/data_type_error_handler_mock.cc
rename to components/sync/api/data_type_error_handler_mock.cc
index 3005dace84ce79dccbed1fb6effcca11d48db5bf..f0ef82d2d1be658c40260f9c3884859b40be4b3f 100644
--- a/components/sync/core_impl/test/data_type_error_handler_mock.cc
+++ b/components/sync/api/data_type_error_handler_mock.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/sync/core/test/data_type_error_handler_mock.h"
+#include "components/sync/api/data_type_error_handler_mock.h"
 
 namespace syncer {
 
@@ -12,8 +12,7 @@ DataTypeErrorHandlerMock::~DataTypeErrorHandlerMock() {
   DCHECK_EQ(SyncError::UNSET, expected_error_type_);
 }
 
-void DataTypeErrorHandlerMock::OnSingleDataTypeUnrecoverableError(
-    const SyncError& error) {
+void DataTypeErrorHandlerMock::OnUnrecoverableError(const SyncError& error) {
   DCHECK_NE(SyncError::UNSET, expected_error_type_);
   DCHECK(error.IsSet());
   DCHECK_EQ(expected_error_type_, error.error_type());
@@ -32,4 +31,8 @@ void DataTypeErrorHandlerMock::ExpectError(SyncError::ErrorType error_type) {
   expected_error_type_ = error_type;
 }
 
+std::unique_ptr<DataTypeErrorHandler> DataTypeErrorHandlerMock::Copy() const {
+  return nullptr;
+}
+
 }  // namespace syncer