no bug number, part of webshell cleanup. nsIWebShell.h was needlessly included, so I removed it

trivial change, no reviewer.


git-svn-id: svn://10.0.0.236/trunk@50822 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/html/document/src/nsFrameSetFrame.cpp

@@ -20,7 +20,6 @@
 #include "nsIHTMLContent.h"
 #include "nsLeafFrame.h"
 #include "nsHTMLContainerFrame.h"
-#include "nsIWebShell.h"
 #include "nsIPresContext.h"
 #include "nsIPresShell.h"
 #include "nsHTMLIIDs.h"