Navigation: move RestoreType and ReloadType into a separate file

content/public/browser/restore_type.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_BROWSER_RESTORE_TYPE_H_
+#define CONTENT_PUBLIC_BROWSER_RESTORE_TYPE_H_
+
+namespace content {
+
+// Enumerations of the possible restore types.
+enum class RestoreType {
+  // Restore from the previous session.
+  LAST_SESSION_EXITED_CLEANLY,
+  LAST_SESSION_CRASHED,
+
+  // The entry has been restored from the current session. This is used when
+  // the user issues 'reopen closed tab'.
+  CURRENT_SESSION,
+
+  // The entry was not restored.
+  NONE
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_RESTORE_TYPE_H_