Header include dependency cleanup. b=64023 r=jag rs=brendan

git-svn-id: svn://10.0.0.236/trunk@99299 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/forms/nsComboboxControlFrame.cpp

@@ -66,6 +66,7 @@
 #include "nsIAccessibilityService.h"
 #include "nsIServiceManager.h"
 #include "nsIDOMNode.h"
+#include "nsGUIEvent.h"
 
 static NS_DEFINE_CID(kTextNodeCID,   NS_TEXTNODE_CID);
 static NS_DEFINE_CID(kHTMLElementFactoryCID,   NS_HTML_ELEMENT_FACTORY_CID);