Remove header files that only have includes.

fpdfsdk/src/pdfwindow/PWL_ListBox.cpp

Index: fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
diff --git a/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp b/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
index 685da4fd349e6b6db33b3c0117a707b2311fe29b..e3e83f9c7a3766ea3b69ca29c0feccf1d0000981 100644
--- a/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
+++ b/fpdfsdk/src/pdfwindow/PWL_ListBox.cpp
@@ -4,21 +4,20 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "fpdfsdk/include/pdfwindow/PDFWindow.h"
+#include "fpdfsdk/include/pdfwindow/PWL_ListBox.h"
+
 #include "fpdfsdk/include/pdfwindow/PWL_Edit.h"
 #include "fpdfsdk/include/pdfwindow/PWL_EditCtrl.h"
-#include "fpdfsdk/include/pdfwindow/PWL_ListBox.h"
 #include "fpdfsdk/include/pdfwindow/PWL_ScrollBar.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
+#include "public/fpdf_fwlevent.h"
 
 #define IsFloatZero(f) ((f) < 0.0001 && (f) > -0.0001)
 #define IsFloatBigger(fa, fb) ((fa) > (fb) && !IsFloatZero((fa) - (fb)))
 #define IsFloatSmaller(fa, fb) ((fa) < (fb) && !IsFloatZero((fa) - (fb)))
 #define IsFloatEqual(fa, fb) IsFloatZero((fa) - (fb))
 
-/* ------------------------ CPWL_List_Notify ----------------------- */
-
 CPWL_List_Notify::CPWL_List_Notify(CPWL_ListBox* pList) : m_pList(pList) {
   ASSERT(m_pList);
 }
@@ -65,8 +64,6 @@ void CPWL_List_Notify::IOnInvalidateRect(CPDF_Rect* pRect) {
   m_pList->InvalidateRect(pRect);
 }
 
-/* --------------------------- CPWL_ListBox ---------------------------- */
-
 CPWL_ListBox::CPWL_ListBox()
     : m_pList(NULL),
       m_pListNotify(NULL),
@@ -180,8 +177,6 @@ void CPWL_ListBox::DrawThisAppearance(CFX_RenderDevice* pDevice,
       }
 
       if (m_pList->IsItemSelected(i)) {
-        //	CPWL_Utils::DrawFillRect(pDevice, pUser2Device, rcItem,
-        // ArgbEncode(255,0,51,113));
         IFX_SystemHandler* pSysHandler = GetSystemHandler();
         if (pSysHandler && pSysHandler->IsSelectionImplemented()) {
           IFX_Edit::DrawEdit(