Don't rely on the pending NavigationEntry for location.replace.

content/browser/frame_host/navigation_controller_impl.h

 // Copyright 2013 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_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 354 matching lines @@
   // An entry we haven't gotten a response for yet.  This will be discarded
   // when we navigate again.  It's used only so we know what the currently
   // displayed tab is.
   //
   // This may refer to an item in the entries_ list if the pending_entry_index_
   // == -1, or it may be its own entry that should be deleted. Be careful with
   // the memory management.
   NavigationEntryImpl* pending_entry_;
 
   // If a new entry fails loading, details about it are temporarily held here
-  // until the error page is shown. These variables are only valid if
-  // |failed_pending_entry_id_| is not 0.
+  // until the error page is shown (or 0 otherwise).
   //
   // TODO(avi): We need a better way to handle the connection between failed
   // loads and the subsequent load of the error page. This current approach has
   // issues: 1. This might hang around longer than we'd like if there is no
   // error page loaded, and 2. This doesn't work very well for frames.
   // http://crbug.com/474261
   int failed_pending_entry_id_;
-  bool failed_pending_entry_should_replace_;
 
   // The index of the currently visible entry.
   int last_committed_entry_index_;
 
   // The index of the pending entry if it is in entries_, or -1 if
   // pending_entry_ is a new entry (created by LoadURL).
   int pending_entry_index_;
 
   // The index for the entry that is shown until a navigation occurs.  This is
   // used for interstitial pages. -1 if there are no such entry.
@@ skipping 51 matching lines @@
   TimeSmoother time_smoother_;
 
   scoped_ptr<NavigationEntryScreenshotManager> screenshot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_CONTROLLER_IMPL_H_