File browser crash fix

chrome/browser/dom_ui/filebrowse_ui.cc

 // Copyright (c) 2009 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/dom_ui/filebrowse_ui.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/callback.h"
 #include "base/logging.h"
@@ skipping 1057 matching lines @@
     browser->window()->Show();
   }
 
   return browser;
 }
 
 Browser* FileBrowseUI::GetPopupForPath(const std::string& path) {
   for (BrowserList::const_iterator it = BrowserList::begin();
        it != BrowserList::end(); ++it) {
     if ((*it)->type() == Browser::TYPE_POPUP) {
-      const GURL& url =
-          (*it)->GetTabContentsAt((*it)->selected_index())->GetURL();
+      TabContents* tab_contents = (*it)->GetSelectedTabContents();
+      DCHECK(tab_contents);
+      if (!tab_contents)
+          continue;
+      const GURL& url = tab_contents->GetURL();
 
       if (url.SchemeIs(chrome::kChromeUIScheme) &&
           url.host() == chrome::kChromeUIFileBrowseHost &&
           url.ref() == path) {
         return (*it);
       }
     }
   }
 
   return NULL;
 }
 
 const int FileBrowseUI::kPopupWidth = 250;
 const int FileBrowseUI::kPopupHeight = 300;
 const int FileBrowseUI::kSmallPopupWidth = 250;
 const int FileBrowseUI::kSmallPopupHeight = 50;