Remove header files that only have includes.

fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp

Index: fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp
diff --git a/fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp b/fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp
index e22076edd2fcf586acc277cc821dee320e9ad06e..52f25fcd84b0b99407ae8ebddcf012967552c1c2 100644
--- a/fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp
+++ b/fpdfsdk/src/pdfwindow/PWL_SpecialButton.cpp
@@ -4,14 +4,11 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "fpdfsdk/include/pdfwindow/PDFWindow.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Button.h"
 #include "fpdfsdk/include/pdfwindow/PWL_SpecialButton.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
 
-/* --------------------------- CPWL_PushButton ---------------------------- */
-
 CPWL_PushButton::CPWL_PushButton() {}
 
 CPWL_PushButton::~CPWL_PushButton() {}
@@ -24,8 +21,6 @@ CPDF_Rect CPWL_PushButton::GetFocusRect() const {
   return CPWL_Utils::DeflateRect(GetWindowRect(), (FX_FLOAT)GetBorderWidth());
 }
 
-/* --------------------------- CPWL_CheckBox ---------------------------- */
-
 CPWL_CheckBox::CPWL_CheckBox() : m_bChecked(FALSE) {}
 
 CPWL_CheckBox::~CPWL_CheckBox() {}
@@ -55,8 +50,6 @@ FX_BOOL CPWL_CheckBox::OnChar(FX_WORD nChar, FX_DWORD nFlag) {
   return TRUE;
 }
 
-/* --------------------------- CPWL_RadioButton ---------------------------- */
-
 CPWL_RadioButton::CPWL_RadioButton() : m_bChecked(FALSE) {}
 
 CPWL_RadioButton::~CPWL_RadioButton() {}