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

content/renderer/render_view_impl.h

 // Copyright (c) 2012 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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 838 matching lines @@
   // TODO(nasko): Move to RenderFrame, as this is per-frame state.
   scoped_ptr<FrameMsg_Navigate_Params> pending_navigation_params_;
 
   // Timer used to delay the updating of nav state (see SyncNavigationState).
   base::OneShotTimer<RenderViewImpl> nav_state_sync_timer_;
 
   // Page IDs ------------------------------------------------------------------
   // 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_;
 
   // The offset of the current item in the history list.
   int history_list_offset_;
 
   // The RenderView's current impression of the history length.  This includes
   // any items that have committed in this process, but because of cross-process
   // navigations, the history may have some entries that were committed in other
@@ skipping 182 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_