Don't use mock PagePopup if possible.

LayoutTests/fast/forms/calendar-picker/date-picker-events.html

Index: LayoutTests/fast/forms/calendar-picker/date-picker-events.html
diff --git a/LayoutTests/fast/forms/calendar-picker/date-picker-events.html b/LayoutTests/fast/forms/calendar-picker/date-picker-events.html
index a3d6df9d87c9c8391f7e0716f639d7d33acf57cc..4fd9eec611b91b4ef653a193d65330e3b23b40a1 100644
--- a/LayoutTests/fast/forms/calendar-picker/date-picker-events.html
+++ b/LayoutTests/fast/forms/calendar-picker/date-picker-events.html
@@ -25,7 +25,7 @@ var date1 = document.getElementById('date1');
 date1.addEventListener('input', recordEvent, false);
 date1.addEventListener('change', recordEvent, false);
 
-openPickerWithMock(date1, test1);
+openPicker(date1, test1);
 
 function test1() {
     eventSender.keyDown('rightArrow');
@@ -39,7 +39,7 @@ function test1() {
 
     eventsCounter = {};
     waitUntilClosing(function() {
-        openPickerWithMock(date1, test2);
+        openPicker(date1, test2);
     });
 }