Revert "Add Safari useragent detection."

This reverts commit 723897c.

lib/ace/lib/useragent.js

@@ -64,10 +64,6 @@ if (typeof navigator != "object")
 var os = (navigator.platform.match(/mac|win|linux/i) || ["other"])[0].toLowerCase();
 var ua = navigator.userAgent;
 
-var safariRegex = /version\/([\w\.]+).+?(mobile\s?safari|safari)/i;
-var safariResult = ua.match(safariRegex);
-var safariVersion = safariResult ? parseFloat(safariResult[1]) : 0;
-
 // Is the user using a browser that identifies itself as Windows
 exports.isWin = (os == "win");
 
@@ -99,8 +95,6 @@ exports.isWebKit = parseFloat(ua.split("WebKit/")[1]) || undefined;
 
 exports.isChrome = parseFloat(ua.split(" Chrome/")[1]) || undefined;
 
-exports.isSafari = safariVersion || undefined;
-
 exports.isAIR = ua.indexOf("AdobeAIR") >= 0;
 
 exports.isIPad = ua.indexOf("iPad") >= 0;