Issue #1751 - Remove Mac code behind MOZ_WIDGET_TOOLKIT == 'cocoa'

toolkit/themes/osx/global/groupbox.css

@@ -1,30 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
-
-groupbox {
-  padding: 5px 1px 1px;
-  padding-inline-start: 0;
-  margin: 6px;
-}
-
-.groupbox-body {
-  -moz-appearance: groupbox;
-  padding: 8px 8px 3px;
-  margin: 0;
-}
-
-caption {
-  padding-inline-start: 4px;
-  padding-bottom: 1px;
-  font: caption;
-}
-
-/* !important is needed to override label in global.css */
-.caption-text {
-  margin-top: 0 !important;
-  margin-bottom: 0 !important;
-  margin-inline-start: 1px !important;
-}