Remove include only fwl.h and IWYU.

xfa/src/fwl/src/core/fwl_widgetmgrimp.cpp

Index: xfa/src/fwl/src/core/fwl_widgetmgrimp.cpp
diff --git a/xfa/src/fwl/src/core/fwl_widgetmgrimp.cpp b/xfa/src/fwl/src/core/fwl_widgetmgrimp.cpp
index 9464776a684b0d573def6d7d203bfc9cd5441784..7255569500b6188d61206f53b9a683da0283019b 100644
--- a/xfa/src/fwl/src/core/fwl_widgetmgrimp.cpp
+++ b/xfa/src/fwl/src/core/fwl_widgetmgrimp.cpp
@@ -4,12 +4,18 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
+#include "xfa/src/fwl/src/core/include/fwl_widgetmgrimp.h"
+
+#include "xfa/include/fwl/adapter/fwl_adapternative.h"
+#include "xfa/include/fwl/adapter/fwl_adapterwidgetmgr.h"
+#include "xfa/include/fwl/core/fwl_app.h"
+#include "xfa/include/fwl/core/fwl_form.h"
 #include "xfa/src/foxitlib.h"
 #include "xfa/src/fwl/src/core/include/fwl_appimp.h"
 #include "xfa/src/fwl/src/core/include/fwl_noteimp.h"
 #include "xfa/src/fwl/src/core/include/fwl_targetimp.h"
 #include "xfa/src/fwl/src/core/include/fwl_threadimp.h"
-#include "xfa/src/fwl/src/core/include/fwl_widgetmgrimp.h"
+#include "xfa/src/fwl/src/core/include/fwl_widgetimp.h"
 
 FX_BOOL FWL_UseOffscreen(IFWL_Widget* pWidget) {
 #if (_FX_OS_ == _FX_MACOSX_)