From 2d1c35caca4750960e778d536f0faf7dd1a09ac0 Mon Sep 17 00:00:00 2001
From: DannyS712 <dannys712.wiki@gmail.com>
Date: Tue, 21 Sep 2021 21:56:49 +0000
Subject: [PATCH] resourceloader: drop some unneeded startup compatibility
 checks

Remove check for window.JSON, redundant to check for es5
strict mode.

Remove check for window.addEventListener, we also check for
querySelector which is a newer part of the same API.

Bug: T290293
Change-Id: I95e62c7c1ed8f98f9df9e94fef86dda9aa77326b
---
 resources/src/startup/startup.js | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/resources/src/startup/startup.js b/resources/src/startup/startup.js
index da4ea680cc2..ed2a76f2ecd 100644
--- a/resources/src/startup/startup.js
+++ b/resources/src/startup/startup.js
@@ -11,9 +11,8 @@
  *
  * Capabilities required for modern run-time:
  * - ECMAScript 5
- * - DOM Level 4 & Selectors API Level 1
- * - HTML5 & Web Storage
- * - DOM Level 2 Events
+ * - DOM Level 4 (including Selectors API)
+ * - HTML5 (including Web Storage API)
  *
  * Browsers we support in our modern run-time (Grade A):
  * - Chrome 13+
@@ -52,10 +51,9 @@ function isCompatible( ua ) {
 	return !!(
 		// https://caniuse.com/#feat=es5
 		// https://caniuse.com/#feat=use-strict
-		// https://caniuse.com/#feat=json / https://phabricator.wikimedia.org/T141344#2784065
 		( function () {
 			'use strict';
-			return !this && Function.prototype.bind && window.JSON;
+			return !this && Function.prototype.bind;
 		}() ) &&
 
 		// https://caniuse.com/#feat=queryselector
@@ -66,9 +64,6 @@ function isCompatible( ua ) {
 		// https://blog.whatwg.org/this-week-in-html-5-episode-30
 		'localStorage' in window &&
 
-		// https://caniuse.com/#feat=addeventlistener
-		'addEventListener' in window &&
-
 		// Hardcoded exceptions for browsers that pass the requirement but we don't
 		// want to support in the modern run-time.
 		//