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 {
+
+// Note: NO_RELOAD is used in general, but behaviors depend on context.

[Charlie Reis, 2016/09/09 05:41:05]

There's no NO_RELOAD type below.  Did you mean NONE?

(Also, please start by saying something about ReloadType in general.)

[Takashi Toyoshima, 2016/09/09 07:31:30]

Done.

+// If it is used for tab restore, or history navigation, it loads preferring

[Charlie Reis, 2016/09/09 05:41:05]

Can you clarify this sentence?  I don't know what "it" refers to.

[Takashi Toyoshima, 2016/09/09 07:31:30]

Done.

+// 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_