New SELECT popup: Delay change event dispatching when an option is selected.

Source/web/PopupMenuImpl.cpp

Index: Source/web/PopupMenuImpl.cpp
diff --git a/Source/web/PopupMenuImpl.cpp b/Source/web/PopupMenuImpl.cpp
index d898f80d9ef67ab0f454473e4c4dd3c8b670e964..01c5be3a14c523a163ebf265a9fcf3fd3e047bfa 100644
--- a/Source/web/PopupMenuImpl.cpp
+++ b/Source/web/PopupMenuImpl.cpp
@@ -11,6 +11,7 @@
 #include "core/dom/ExecutionContextTask.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/StyleEngine.h"
+#include "core/events/ScopedEventQueue.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLHRElement.h"
 #include "core/html/HTMLOptGroupElement.h"
@@ -404,6 +405,7 @@ void PopupMenuImpl::setValueAndClosePopup(int numValue, const String& stringValu
 {
     ASSERT(m_popup);
     ASSERT(m_ownerElement);
+    EventQueueScope scope;
     RefPtrWillBeRawPtr<PopupMenuImpl> protector(this);
     bool success;
     int listIndex = stringValue.toInt(&success);