Bug 1565274: Remove self inclusion from nsPageSequenceFrame.h r=dholbert

nsPageSequenceFrame.h includes itself.

Differential Revision: https://phabricator.services.mozilla.com/D37770

--HG--
extra : moz-landing-system : lando

layout/generic/nsPageSequenceFrame.h

@@ -7,7 +7,6 @@
 #define nsPageSequenceFrame_h___
 
 #include "mozilla/Attributes.h"
-#include "nsPageSequenceFrame.h"
 #include "nsContainerFrame.h"
 #include "nsIPrintSettings.h"