Navigation: move RestoreType and ReloadType into a separate file

content/public/browser/reload_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_RELOAD_TYPE_H_
+#define CONTENT_PUBLIC_BROWSER_RELOAD_TYPE_H_
+
+namespace content {
+
+// Used to specify detailed behavior on requesting reloads. NONE is used in
+// general, but behaviors depend on context. If NONE is used for tab restore, or
+// history navigation, it loads preferring cache (which may be stale).
+enum class ReloadType {
+  NONE,                  // Normal load, restore, or history navigation.
+  NORMAL,                // Normal (cache-validating) reload.
+  MAIN_RESOURCE,         // Reload validating only the main resource.
+  BYPASSING_CACHE,       // Reload bypassing the cache (shift-reload).
+  ORIGINAL_REQUEST_URL,  // Reload using the original request URL.
+  DISABLE_LOFI_MODE      // Reload with Lo-Fi mode disabled.
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_RELOAD_TYPE_H_