Fix back button behavior for DOMUI contents (or at least make it as not-broke...

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/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 36 matching lines @@
 // get confused if we navigate back to it.
 //
 // An empty state is treated as a new navigation by WebKit, which would mean
 // losing the navigation entries and generating a new navigation entry after
 // this one. We don't want that. To avoid this we create a valid state which
 // WebKit will not treat as a new navigation.
 void SetContentStateIfEmpty(NavigationEntry* entry) {
   if (entry->content_state().empty() &&
       (entry->tab_type() == TAB_CONTENTS_WEB ||
        entry->tab_type() == TAB_CONTENTS_NEW_TAB_UI ||
+       entry->tab_type() == TAB_CONTENTS_DOM_UI ||
        entry->tab_type() == TAB_CONTENTS_ABOUT_UI ||
        entry->tab_type() == TAB_CONTENTS_HTML_DIALOG ||
        entry->IsViewSourceMode())) {
     entry->set_content_state(
         webkit_glue::CreateHistoryStateForURL(entry->url()));
   }
 }
 
 // Configure all the NavigationEntries in entries for restore. This resets
 // the transition type to reload and makes sure the content state isn't empty.
@@ skipping 1158 matching lines @@
       return i;
   }
   return -1;
 }
 
 NavigationEntry* NavigationController::GetTransientEntry() const {
   if (transient_entry_index_ == -1)
     return NULL;
   return entries_[transient_entry_index_].get();
 }