Only execute default actions on trusted events.

LayoutTests/fast/forms/range/slider-zoomed.html

Index: LayoutTests/fast/forms/range/slider-zoomed.html
diff --git a/LayoutTests/fast/forms/range/slider-zoomed.html b/LayoutTests/fast/forms/range/slider-zoomed.html
index 23a36814cd7bcda4929ba939ba9a9a0b5ed99714..efa0aefacb1266d7ccedcde5151330a732db82af 100644
--- a/LayoutTests/fast/forms/range/slider-zoomed.html
+++ b/LayoutTests/fast/forms/range/slider-zoomed.html
@@ -18,19 +18,14 @@
     if (window.testRunner)
         testRunner.dumpAsText();
 
-    function dispatchEvent(eventType, clientX, clientY)
-    {
-      var ev = document.createEvent("MouseEvent");
-      ev.initMouseEvent(eventType, true, true, window, 1, 1, 1, clientX, clientY, false, false, false, false, 0, document);
-      var target = document.elementFromPoint(ev.clientX, ev.clientY);
-      target.dispatchEvent(ev);
-    }
-    
     function test()
     {
       // For some reason the slider needs mouseup/mousedown, not just a "click"
-      dispatchEvent("mousedown", 150, 15);
-      dispatchEvent("mouseup", 150, 15);
+      if (window.eventSender) {
+          eventSender.mouseMoveTo(150, 15);
+          eventSender.mouseDown(0);
+          eventSender.mouseUp(0);
+      }
 
       const expectedValue = 72;
       var val = document.getElementById('slider').value;
@@ -48,4 +43,4 @@
   <div id="results">
   </div>
 </body>
-</html>
+</html>