Better remove HistoryNodes

content/renderer/history_serialization.cc

 // Copyright 2014 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/renderer/history_serialization.h"
 
 #include "content/common/page_state_serialization.h"
 #include "content/public/common/page_state.h"
 #include "content/renderer/history_entry.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
@@ skipping 77 matching lines @@
   state->referrer_policy = item.referrerPolicy();
   state->target = item.target();
   if (!item.stateObject().isNull())
     state->state_object = item.stateObject().toString();
   state->scroll_restoration_type = item.scrollRestorationType();
   state->pinch_viewport_scroll_offset = item.pinchViewportScrollOffset();
   state->scroll_offset = item.scrollOffset();
   state->item_sequence_number = item.itemSequenceNumber();
   state->document_sequence_number =
       item.documentSequenceNumber();
-  state->frame_sequence_number =
-      item.frameSequenceNumber();
   state->page_scale_factor = item.pageScaleFactor();
   ToNullableString16Vector(item.documentState(), &state->document_state);
 
   state->http_body.http_content_type = item.httpContentType();
   const WebHTTPBody& http_body = item.httpBody();
   state->http_body.is_null = http_body.isNull();
   if (!state->http_body.is_null) {
     state->http_body.identifier = http_body.identifier();
     state->http_body.elements.resize(http_body.elementCount());
     for (size_t i = 0; i < http_body.elementCount(); ++i) {
@@ skipping 38 matching lines @@
   item.setScrollOffset(state.scroll_offset);
   item.setPageScaleFactor(state.page_scale_factor);
 
   // These values are generated at WebHistoryItem construction time, and we
   // only want to override those new values with old values if the old values
   // are defined.  A value of 0 means undefined in this context.
   if (state.item_sequence_number)
     item.setItemSequenceNumber(state.item_sequence_number);
   if (state.document_sequence_number)
     item.setDocumentSequenceNumber(state.document_sequence_number);
-  if (state.frame_sequence_number)
-    item.setFrameSequenceNumber(state.frame_sequence_number);
 
   item.setHTTPContentType(state.http_body.http_content_type);
   if (!state.http_body.is_null) {
     WebHTTPBody http_body;
     http_body.initialize();
     http_body.setIdentifier(state.http_body.identifier);
     for (size_t i = 0; i < state.http_body.elements.size(); ++i)
       AppendHTTPBodyElement(state.http_body.elements[i], &http_body);
     item.setHTTPBody(http_body);
   }
@@ skipping 35 matching lines @@
   if (!DecodePageState(page_state.ToEncodedData(), &state))
     return scoped_ptr<HistoryEntry>();
 
   scoped_ptr<HistoryEntry> entry(new HistoryEntry());
   RecursivelyGenerateHistoryItem(state.top, entry->root_history_node());
 
   return entry.Pass();
 }
 
 }  // namespace content