Only execute default actions on trusted events.

LayoutTests/fast/forms/listbox-onchange.html

Index: LayoutTests/fast/forms/listbox-onchange.html
diff --git a/LayoutTests/fast/forms/listbox-onchange.html b/LayoutTests/fast/forms/listbox-onchange.html
index ccb3d05884b805808fec2056e93e8e2e42bd98ed..19b50b037e925e91933ede1fe45995ff40f2a6b1 100644
--- a/LayoutTests/fast/forms/listbox-onchange.html
+++ b/LayoutTests/fast/forms/listbox-onchange.html
@@ -119,53 +119,51 @@
                 if (window.testRunner)
                     testRunner.notifyDone();
             }
+
+            function buildModifiers(shift, metaOrCtrl) {
+                modifiers = [];
+                if (shift)
+                    modifiers.push("shiftKey");
+                if (metaOrCtrl)
+                    modifiers.push("addSelectionKey");
+                return modifiers;
+            }
             
             function mouseDownOnSelect(selId, index, shift, metaOrCtrl)
             {
-                var meta = false;
-                var ctrl = false;
-                if (metaOrCtrl) {
-                    if (navigator.userAgent.search(/\bMac OS X\b/) != -1)
-                        meta = true;
-                    else
-                        ctrl = true;
-                }
+                modifiers = buildModifiers(shift, metaOrCtrl);
                 var sl = document.getElementById(selId);
-                var event = document.createEvent("MouseEvent");
-                event.initMouseEvent("mousedown", true, true, document.defaultView, 1, 0, 0, 0, 0, ctrl, false, shift, meta, 0, document);
-                sl.options[index].dispatchEvent(event);
+                var rect = sl.options[index].getBoundingClientRect();
+                if (window.eventSender) {
+                    eventSender.mouseMoveTo(rect.left + 1, rect.top + 1);
+                    eventSender.mouseDown(0, modifiers);
+                } else {
+                    testFailed("This test requires window.eventSender.");
+                }
             }
 
             function mouseUpOnSelect(selId, index, shift, metaOrCtrl)
             {
-                var meta = false;
-                var ctrl = false;
-                if (metaOrCtrl) {
-                    if (navigator.userAgent.search(/\bMac OS X\b/) != -1)
-                        meta = true;
-                    else
-                        ctrl = true;
-                }
+                modifiers = buildModifiers(shift, metaOrCtrl);
                 var sl = document.getElementById(selId);
-                var event = document.createEvent("MouseEvent");
-                event.initMouseEvent("mouseup", true, true, document.defaultView, 1, 0, 0, 0, 0, ctrl, false, shift, meta, 0, document);
-                sl.options[index].dispatchEvent(event);
+                var rect = sl.options[index].getBoundingClientRect();
+                if (window.eventSender) {
+                    eventSender.mouseMoveTo(rect.left + 1, rect.top + 1);
+                    eventSender.mouseUp(0, modifiers);
+                } else {
+                    testFailed("This test requires window.eventSender.");
+                }
             }
 
             function keyDownOnSelect(selId, identifier, shift, metaOrCtrl)
             {
-                modifiers = [];
-                if (shift)
-                    modifiers[0] = "shiftKey";
-                if (metaOrCtrl) {
-                    if (navigator.userAgent.search(/\bMac OS X\b/) != -1)
-                        modifiers[modifiers.length] = "metaKey";
-                    else
-                        modifiers[modifiers.length] = "controlKey";
-                }
-
+                modifiers = buildModifiers(shift, metaOrCtrl);
                 document.getElementById(selId).focus();
-                eventSender.keyDown(identifier, modifiers);
+                if (window.eventSender) {
+                    eventSender.keyDown(identifier, modifiers);
+                } else {
+                    testFailed("This test requires window.eventSender.");
+                }
             }
             
             function getSelectedOptions(selId)