Classify navigations without page id in parallel to the existing classifier.

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index 62349d7a5ac29ec0a0eb8ba01e485352eefeac70..9227ece613f5223624c835b1699d1455bcd2aff9 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -110,7 +110,8 @@ scoped_ptr<NavigationRequest> NavigationRequest::CreateRendererInitiated(
   // renderer and sent to the browser instead of being measured here.
   scoped_ptr<NavigationRequest> navigation_request(new NavigationRequest(
       frame_tree_node, common_params, begin_params, CommitNavigationParams(),
-      HistoryNavigationParams(PageState(), -1, -1, current_history_list_offset,
+      HistoryNavigationParams(PageState(), -1, 0, -1,
+                              current_history_list_offset,
                               current_history_list_length, false),
       body, false, nullptr));
   return navigation_request.Pass();