refactor: remove unused JSONEditingDescriptor

Removing js file related to it as well, since it's not being used
anywhere, unlike with other removed descriptors.

xmodule/editing_module.py

@@ -96,15 +96,3 @@ class TabsEditingDescriptor(TabsEditingMixin, MakoModuleDescriptor):  # lint-amn
     settings tab in your module descriptor.
     """
     pass  # lint-amnesty, pylint: disable=unnecessary-pass
-
-
-class JSONEditingDescriptor(EditingDescriptor):  # lint-amnesty, pylint: disable=abstract-method
-    """
-    Module that provides a raw editing view of its data as XML. It does not perform
-    any validation of its definition
-    """
-
-    css = {'scss': [resource_string(__name__, 'css/codemirror/codemirror.scss')]}
-
-    js = {'js': [resource_string(__name__, 'js/src/raw/edit/json.js')]}
-    js_module_name = "JSONEditingDescriptor"

xmodule/js/src/raw/edit/json.js

@@ -1,32 +0,0 @@
-// Once generated by CoffeeScript 1.9.3, but now lives as pure JS
-/* eslint-disable */
-(function() {
-  var extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
-    hasProp = {}.hasOwnProperty;
-
-  this.JSONEditingDescriptor = (function(superClass) {
-    extend(JSONEditingDescriptor, superClass);
-
-    function JSONEditingDescriptor(element) {
-      this.element = element;
-      this.edit_box = CodeMirror.fromTextArea($(".edit-box", this.element)[0], {
-        mode: {
-          name: "javascript",
-          json: true
-        },
-        lineNumbers: true,
-        lineWrapping: true
-      });
-    }
-
-    JSONEditingDescriptor.prototype.save = function() {
-      return {
-        data: JSON.parse(this.edit_box.getValue())
-      };
-    };
-
-    return JSONEditingDescriptor;
-
-  })(XModule.Descriptor);
-
-}).call(this);