Remove Env's calculation of executionTime

[#45659879]

src/core/Env.js

@@ -2,8 +2,7 @@ getJasmineRequireObj().Env = function(j$) {
   function Env(options) {
     options = options || {};
     var self = this;
-    var global = options.global || j$.getGlobal(),
-      now = options.now || function() { return new Date().getTime(); };
+    var global = options.global || j$.getGlobal();
 
     var catchExceptions = true;
 
@@ -194,13 +193,10 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     this.execute = function() {
-      var startTime = now();
       this.reporter.jasmineStarted({
         totalSpecsDefined: totalSpecsDefined
       });
-      this.topSuite.execute(function() {
-        self.reporter.jasmineDone({executionTime: now() - startTime});
-      });
+      this.topSuite.execute(self.reporter.jasmineDone);
     };
   }