Remove the use of page id from building the commit params.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index f8b0a313b01fbdb96bd786fbc11cb1817a97da08..f7b44f1039c9604697ccf53bdc02feac966b2290 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -857,13 +857,6 @@ class CONTENT_EXPORT RenderViewImpl
   // See documentation in RenderView.
   int32 page_id_;
 
-  // Indicates the ID of the last page that we sent a FrameNavigate to the
-  // browser for. This is used to determine if the most recent transition
-  // generated a history entry (less than page_id_), or not (equal to or
-  // greater than). Note that this will be greater than page_id_ if the user
-  // goes back.
-  int32 last_page_id_sent_to_browser_;
-
   // The next available page ID to use for this RenderView.  These IDs are
   // specific to a given RenderView and the frames within it.
   int32 next_page_id_;