Move xfa/fxfa/include to xfa/fxfa

BUG=pdfium:611

Review-Url: https://codereview.chromium.org/2383593002
diff --git a/fpdfsdk/cpdfsdk_xfawidget.cpp b/fpdfsdk/cpdfsdk_xfawidget.cpp
index 516f7bd..de4bd23 100644
--- a/fpdfsdk/cpdfsdk_xfawidget.cpp
+++ b/fpdfsdk/cpdfsdk_xfawidget.cpp
@@ -7,7 +7,7 @@
 #include "fpdfsdk/cpdfsdk_xfawidget.h"
 
 #include "fpdfsdk/ipdfsdk_annothandler.h"
-#include "xfa/fxfa/include/xfa_ffwidget.h"
+#include "xfa/fxfa/xfa_ffwidget.h"
 
 CPDFSDK_XFAWidget::CPDFSDK_XFAWidget(CXFA_FFWidget* pAnnot,
                                      CPDFSDK_PageView* pPageView,