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

components/sync/api/data_type_error_handler_impl.h

Index: components/sync/api/data_type_error_handler_impl.h
diff --git a/components/sync/api/data_type_error_handler_impl.h b/components/sync/api/data_type_error_handler_impl.h
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index 0000000000000000000000000000000000000000..678888d79acca2e7a14a4482db5fd35ea7bd9fef
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+++ b/components/sync/api/data_type_error_handler_impl.h
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+// 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_API_DATA_TYPE_ERROR_HANDLER_IMPL_H__
+#define COMPONENTS_SYNC_API_DATA_TYPE_ERROR_HANDLER_IMPL_H__
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
+#include "components/sync/api/data_type_error_handler.h"
+
+namespace syncer {
+
+// The standard implementation of DataTypeErrorHandler.
+class DataTypeErrorHandlerImpl : public DataTypeErrorHandler {
+ public:
+  typedef base::Callback<void(const syncer::SyncError&)> ErrorCallback;
+
+  DataTypeErrorHandlerImpl(
+      const scoped_refptr<base::SingleThreadTaskRunner>& ui_thread,
+      const base::Closure& dump_stack,
+      const ErrorCallback& sync_callback);
+  ~DataTypeErrorHandlerImpl() override;
+
+  void OnUnrecoverableError(const SyncError& error) override;
+  SyncError CreateAndUploadError(const tracked_objects::Location& location,
+                                 const std::string& message,
+                                 ModelType type) override;
+  std::unique_ptr<DataTypeErrorHandler> Copy() const override;
+
+ private:
+  // The thread task runner that |sync_callback_| runs on. This is passed in
+  // separately instead of bound inside the callback because we want to be able
+  // to perform the PostTask using the error location.
+  scoped_refptr<base::SingleThreadTaskRunner> ui_thread_;
+
+  // The callback to dump and upload the stack from the current thread.
+  base::Closure dump_stack_;
+
+  // The callback used to inform sync of the error on the |ui_thread_|.
+  ErrorCallback sync_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataTypeErrorHandlerImpl);
+};
+
+}  // namespace syncer
+
+#endif  // COMPONENTS_SYNC_API_DATA_TYPE_ERROR_HANDLER_IMPL_H__