disable [add folder] button for media galleries dialog if

chrome/browser/media_gallery/media_galleries_dialog_controller.cc

 // 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.
 
 #include "chrome/browser/media_gallery/media_galleries_dialog_controller.h"
 
 #include "base/path_service.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/media_gallery/media_galleries_preferences_factory.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
@@ skipping 54 matching lines @@
        iter != permissions().end(); iter++) {
     if (iter->second.allowed)
       return true;
   }
   return false;
 }
 
 void MediaGalleriesDialogController::OnAddFolderClicked() {
   FilePath user_data_dir;
   PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
-  // TODO(estade): if file dialogs are disabled we need to handle it somehow.
   select_folder_dialog_ =
       ui::SelectFileDialog::Create(this, new ChromeSelectFilePolicy(NULL));
   select_folder_dialog_->SelectFile(
       ui::SelectFileDialog::SELECT_FOLDER,
       l10n_util::GetStringUTF16(IDS_MEDIA_GALLERIES_DIALOG_ADD_GALLERY_TITLE),
       user_data_dir,
       NULL, 0, FILE_PATH_LITERAL(""),
       tab_contents_->web_contents()->GetView()->GetTopLevelNativeWindow(),
       NULL);
 }
@@ skipping 110 matching lines @@
     preferences_->SetGalleryPermissionForExtension(
         *extension_, id, true);
   }
 }
 
 // MediaGalleries dialog -------------------------------------------------------
 
 MediaGalleriesDialog::~MediaGalleriesDialog() {}
 
 }  // namespace chrome