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 db5540b3089dc4c7d8f6f23200934332fdc2f390..53f8ce75b9cc5668bbd9089ae74d90264e3cb0e2 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -856,13 +856,6 @@ 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_;