Revert of Fix HistoryEntry corruption when commit isn't for provisional entry.

content/renderer/history_controller.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.
 
 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  *     (http://www.torchmobile.com/)
  *
@@ skipping 169 matching lines @@
 }
 
 void HistoryController::UpdateForCommit(RenderFrameImpl* frame,
                                         const WebHistoryItem& item,
                                         WebHistoryCommitType commit_type,
                                         bool navigation_within_page) {
   switch (commit_type) {
     case blink::WebBackForwardCommit:
       if (!provisional_entry_)
         return;
-      // Commit the provisional entry, but only if this back/forward item
-      // matches it.  Otherwise it could be a commit from an earlier attempt to
-      // go back/forward, and we should leave the provisional entry in place.
-      if (HistoryEntry::HistoryNode* node =
-              provisional_entry_->GetHistoryNodeForFrame(frame)) {
-        if (node->item().itemSequenceNumber() == item.itemSequenceNumber())
-          current_entry_.reset(provisional_entry_.release());
-      }
+      current_entry_.reset(provisional_entry_.release());
       if (HistoryEntry::HistoryNode* node =
               current_entry_->GetHistoryNodeForFrame(frame)) {
         node->set_item(item);
       }
       break;
     case blink::WebStandardCommit:
       CreateNewBackForwardItem(frame, item, navigation_within_page);
       break;
     case blink::WebInitialCommitInChildFrame:
       UpdateForInitialLoadInChildFrame(frame, item);
@@ skipping 47 matching lines @@
     bool clone_children_of_target) {
   if (!current_entry_) {
     current_entry_.reset(new HistoryEntry(new_item));
   } else {
     current_entry_.reset(current_entry_->CloneAndReplace(
         new_item, clone_children_of_target, target_frame, render_view_));
   }
 }
 
 }  // namespace content