Delete unneeded pending entries in DidFailProvisionalLoad to prevent a spoof.

content/browser/web_contents/navigation_controller_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_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
@@ skipping 271 matching lines @@
   // contents.
   void FinishRestore(int selected_index, RestoreType type);
 
   // Inserts a new entry or replaces the current entry with a new one, removing
   // all entries after it. The new entry will become the active one.
   void InsertOrReplaceEntry(NavigationEntryImpl* entry, bool replace);
 
   // Removes the entry at |index|, as long as it is not the current entry.
   void RemoveEntryAtIndexInternal(int index);
 
-  // Discards the pending and transient entries.
+  // Discards both the pending and transient entries.
   void DiscardNonCommittedEntriesInternal();
 
-  // Discards the transient entry.
+  // Discards only the pending entry.
+  void DiscardPendingEntry();
+
+  // Discards only the transient entry.
   void DiscardTransientEntry();
 
   // If we have the maximum number of entries, remove the oldest one in
   // preparation to add another.
   void PruneOldestEntryIfFull();
 
   // Removes all entries except the last committed entry.  If there is a new
   // pending navigation it is preserved. In contrast to PruneAllButVisible()
   // this does not update the session history of the RenderView.  Callers
   // must ensure that |CanPruneAllButVisible| returns true before calling this.
@@ skipping 94 matching lines @@
   TimeSmoother time_smoother_;
 
   scoped_ptr<WebContentsScreenshotManager> screenshot_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationControllerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_NAVIGATION_CONTROLLER_IMPL_H_