GTK: Fix a couple minor popup window icon menu bugs.

BUG=26265,26268

Review URL: http://codereview.chromium.org/360023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31009 0039d316-1c4b-4281-b951-d872f2087c98
void MenuGtk::AppendCheckMenuItemWithLabel(int command_id,
                                           const std::string& label) {
  std::string converted_label = ConvertAcceleratorsFromWindowsStyle(label);
  GtkWidget* menu_item =
      gtk_check_menu_item_new_with_mnemonic(converted_label.c_str());
  AppendMenuItem(command_id, menu_item);
}

void MenuGtk::AppendCheckMenuItemWithLabel(int command_id,
                                           const std::string& label) {
  std::string converted_label = ConvertAcceleratorsFromWindowsStyle(label);
  GtkWidget* menu_item =
      gtk_check_menu_item_new_with_mnemonic(converted_label.c_str());
  AppendMenuItem(command_id, menu_item);
}
