Remove unused files from scss directory

UI/WebServerResources/scss/components/backdrop/backdrop.js

@@ -1,31 +0,0 @@
-(function() {
-'use strict';
-
-/*
- * @ngdoc module
- * @name material.components.backdrop
- * @description Backdrop
- */
-
-/**
- * @ngdoc directive
- * @name mdBackdrop
- * @module material.components.backdrop
- *
- * @restrict E
- *
- * @description
- * `<md-backdrop>` is a backdrop element used by other coponents, such as dialog and bottom sheet.
- * Apply class `opaque` to make the backdrop use the theme backdrop color.
- *
- */
-
-angular.module('material.components.backdrop', [
-  'material.core'
-])
-  .directive('mdBackdrop', BackdropDirective);
-
-function BackdropDirective($mdTheming) {
-  return $mdTheming;
-}
-})();