Add item and document sequence numbers to FrameNavigationEntry.

content/public/common/frame_navigate_params.cc

 // Copyright (c) 2011 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.
 
 #include "content/public/common/frame_navigate_params.h"
 
 namespace content {
 
 FrameNavigateParams::FrameNavigateParams()
     : page_id(0),
       nav_entry_id(0),
+      item_sequence_number(-1),
+      document_sequence_number(-1),
       transition(ui::PAGE_TRANSITION_LINK),
       should_update_history(false) {
 }
 
 FrameNavigateParams::~FrameNavigateParams() {
 }
 
 }  // namespace content