Implement Reload for ORIGINAL_REQUEST_URL in NavigationManagerImpl.

ios/web/public/reload_type.h

Index: ios/web/public/reload_type.h
diff --git a/ios/web/public/reload_type.h b/ios/web/public/reload_type.h
index 6ba465309d247ba8a852a15e98ffa32fc4e0c934..0158c079b0bd46b206465aca975efa153f60c6d5 100644
--- a/ios/web/public/reload_type.h
+++ b/ios/web/public/reload_type.h
@@ -12,9 +12,10 @@ enum class ReloadType : short {
   // Reloads the visible item.
   NORMAL = 0,
 
-  // Reloads the visible item using the original URL used to create it. This
-  // is used for cases where the user wants to refresh a page using a different
-  // user agent after following a redirect.
+  // Reloads the transient item, or pending item if transient doesn't exist, or
+  // last committed item if both of them don't exist, using the original URL
+  // used to create it. This is used for cases where the user wants to refresh a
+  // page using a different configuration (e.g. user agent).
   ORIGINAL_REQUEST_URL,
 };