Revert of Update json_schema_compiler to handle the Automation extension API

chrome/browser/resources/chromeos/chromevox/cvox2/background/custom_automation_event.js

-// Copyright 2017 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.
-
-/**
- * @fileoverview Custom Automation Event.
- *
- * An object similar to a chrome.automation.AutomationEvent that we can
- * construct, unlike the object from the extension system.
- */
-
-goog.provide('CustomAutomationEvent');
-
-/**
- * An object we can use instead of a chrome.automation.AutomationEvent.
- * @constructor
- * @extends {chrome.automation.AutomationEvent}
- * @param {chrome.automation.EventType} type The event type.
- * @param {!chrome.automation.AutomationNode} target The event target.
- * @param {string} eventFrom The source of this event.
- */
-var CustomAutomationEvent = function(type, target, eventFrom) {
-  this.type = type;
-  this.target = target;
-  this.eventFrom = eventFrom;
-};
-
-/**
- * @override
- */
-CustomAutomationEvent.prototype.stopPropagation = function() {
-  throw Error('Can\'t call stopPropagation on a CustomAutomationEvent');
-};