Removed spec guards for versions of Safari we no longer support

spec/core/ExceptionFormatterSpec.js

@@ -48,8 +48,6 @@ describe("ExceptionFormatter", function() {
 
   describe("#stack", function() {
     it("formats stack traces", function() {
-      if (jasmine.getEnv().safariVersion < 6) { return; }
-
       var error;
       try { throw new Error("an error") } catch(e) { error = e; }
 

spec/helpers/BrowserFlags.js

@@ -8,10 +8,6 @@
     return match ? parseFloat(match[1]) : void 0;
   }
 
-  env.safariVersion = browserVersion(function(userAgent) {
-    return /Safari/.exec(userAgent) && /Version\/([0-9]{0,})/.exec(userAgent);
-  });
-
   env.firefoxVersion = browserVersion(function(userAgent) {
     return /Firefox\/([0-9]{0,})/.exec(userAgent);
   });