Fix a crasher in the interstitial pages

chrome/browser/tab_contents/navigation_controller.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/tab_contents/navigation_controller.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
@@ skipping 992 matching lines @@
   pending_entry_->ssl() = NavigationEntry::SSLStatus();
 
   if (from_contents && from_contents->type() != pending_entry_->tab_type())
     from_contents->set_is_active(false);
 
   TabContents* contents = GetTabContentsCreateIfNecessary(*pending_entry_);
 
   contents->set_is_active(true);
   active_contents_ = contents;
 
-  if (from_contents && from_contents != contents) {
-    if (from_contents->delegate())
-      from_contents->delegate()->ReplaceContents(from_contents, contents);
-
-    if (from_contents->type() != contents->type()) {
-      // The entry we just discarded needed a different TabContents type. We no
-      // longer need it but we can't destroy it just yet because the TabContents
-      // is very likely involved in the current stack.
-      ScheduleTabContentsCollection(from_contents->type());
-    }
-  }
+  if (from_contents && from_contents != contents && from_contents->delegate())
+    from_contents->delegate()->ReplaceContents(from_contents, contents);
 
   NavigationEntry temp_entry(*pending_entry_);
   if (!contents->NavigateToPendingEntry(reload))
     DiscardNonCommittedEntries();
 }
 
 void NavigationController::NotifyNavigationEntryCommitted(
     LoadCommittedDetails* details) {
   // TODO(pkasting): http://b/1113079 Probably these explicit notification paths
   // should be removed, and interested parties should just listen for the
@@ skipping 190 matching lines @@
       return i;
   }
   return -1;
 }
 
 NavigationEntry* NavigationController::GetTransientEntry() const {
   if (transient_entry_index_ == -1)
     return NULL;
   return entries_[transient_entry_index_].get();
 }