Only execute default actions on trusted events.

LayoutTests/fast/events/option-tab.html

Index: LayoutTests/fast/events/option-tab.html
diff --git a/LayoutTests/fast/events/option-tab.html b/LayoutTests/fast/events/option-tab.html
index f95ca80cae00db55ebf8217eb37de3cd5552549d..b2c5c103b68fda7c730523095472eb9da96f1cde 100644
--- a/LayoutTests/fast/events/option-tab.html
+++ b/LayoutTests/fast/events/option-tab.html
@@ -13,9 +13,10 @@ function test(fieldId)
 {
     window.linkFocused = false;
     document.getElementById(fieldId).focus();
-    var event = document.createEvent("KeyboardEvents");
-    event.initKeyboardEvent("keydown", true, true, document.defaultView, "U+0009", 0, false, true, false, false, false);
-    document.getElementById(fieldId).dispatchEvent(event);
+
+    if (window.eventSender)
+        eventSender.keyDown('\u0009', ["altKey"]);
+
     if (window.linkFocused)
         document.getElementById("console").innerHTML += "SUCCESS: Option-tab did tab to the link (" + fieldId + ").\n";
     else
@@ -23,9 +24,10 @@ function test(fieldId)
 
     window.linkFocused = false;
     document.getElementById(fieldId).focus();
-    event = document.createEvent("KeyboardEvents");
-    event.initKeyboardEvent("keydown", true, true, document.defaultView, "U+0009", 0, false, false, false, false, false);
-    document.getElementById(fieldId).dispatchEvent(event);
+
+    if (window.eventSender)
+        eventSender.keyDown('\u0009', []);
+
     if (window.linkFocused)
         document.getElementById("console").innerHTML += "FAIL: Plain old tab did tab to the link (" + fieldId + ").\n";
     else