Remove browser engine detection

It is out of date and not used anyway.

core/display.js

@@ -10,7 +10,7 @@
 /*jslint browser: true, white: false */
 /*global Util, Base64, changeCursor */
 
-import { Engine, browserSupportsCursorURIs as cursorURIsSupported } from './util/browsers.js';
+import { browserSupportsCursorURIs as cursorURIsSupported } from './util/browsers.js';
 import { set_defaults, make_properties } from './util/properties.js';
 import * as Log from './util/logging.js';
 import Base64 from "./base64.js";
@@ -70,10 +70,6 @@ export default function Display(defaults) {
                            bottom: this._backbuffer.height };
 
     Log.Debug("User Agent: " + navigator.userAgent);
-    if (Engine.gecko) { Log.Debug("Browser: gecko " + Engine.gecko); }
-    if (Engine.webkit) { Log.Debug("Browser: webkit " + Engine.webkit); }
-    if (Engine.trident) { Log.Debug("Browser: trident " + Engine.trident); }
-    if (Engine.presto) { Log.Debug("Browser: presto " + Engine.presto); }
 
     this.clear();
 

core/util/browsers.js

@@ -8,73 +8,6 @@
 
 import * as Log from './logging.js';
 
-// Set browser engine versions. Based on mootools.
-const Features = {xpath: !!(document.evaluate), query: !!(document.querySelector)};
-
-// 'presto': (function () { return (!window.opera) ? false : true; }()),
-var detectPresto = function () {
-    return !!window.opera;
-};
-
-// 'trident': (function () { return (!window.ActiveXObject) ? false : ((window.XMLHttpRequest) ? ((document.querySelectorAll) ? 6 : 5) : 4);
-var detectTrident = function () {
-    if (!window.ActiveXObject) {
-        return false;
-    } else {
-        if (window.XMLHttpRequest) {
-            return (document.querySelectorAll) ? 6 : 5;
-        } else {
-            return 4;
-        }
-    }
-};
-
-// 'webkit': (function () { try { return (navigator.taintEnabled) ? false : ((Features.xpath) ? ((Features.query) ? 525 : 420) : 419); } catch (e) { return false; } }()),
-var detectInitialWebkit = function () {
-    try {
-        if (navigator.taintEnabled) {
-            return false;
-        } else {
-            if (Features.xpath) {
-                return (Features.query) ? 525 : 420;
-            } else {
-                return 419;
-            }
-        }
-    } catch (e) {
-        return false;
-    }
-};
-
-var detectActualWebkit = function (initial_ver) {
-    var re = /WebKit\/([0-9\.]*) /;
-    var str_ver = (navigator.userAgent.match(re) || ['', initial_ver])[1];
-    return parseFloat(str_ver, 10);
-};
-
-// 'gecko': (function () { return (!document.getBoxObjectFor && window.mozInnerScreenX == null) ? false : ((document.getElementsByClassName) ? 19ssName) ? 19 : 18 : 18); }())
-var detectGecko = function () {
-    /* jshint -W041 */
-    if (!document.getBoxObjectFor && window.mozInnerScreenX == null) {
-        return false;
-    } else {
-        return (document.getElementsByClassName) ? 19 : 18;
-    }
-    /* jshint +W041 */
-};
-
-const isWebkitInitial = detectInitialWebkit();
-
-export const Engine = {
-    // Version detection break in Opera 11.60 (errors on arguments.callee.caller reference)
-    //'presto': (function() {
-    //         return (!window.opera) ? false : ((arguments.callee.caller) ? 960 : ((document.getElementsByClassName) ? 950 : 925)); }()),
-    'presto': detectPresto(),
-    'trident': detectTrident(),
-    'webkit': isWebkitInitial ? detectActualWebkit(isWebkitInitial) : false,
-    'gecko': detectGecko()
-};
-
 // Touch detection
 export var isTouchDevice = ('ontouchstart' in document.documentElement) ||
                                  // requried for Chrome debugger

tests/input.html

@@ -39,9 +39,6 @@
             canvas, keyboard, mouse;
 
         var newline = "\n";
-        if (Util.Engine.trident) {
-            var newline = "<br>\n";
-        }
 
         function message(str) {
             console.log(str);