Merge to XFA: Remove header files that only have includes.

fpdfsdk/src/pdfwindow/PWL_Button.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // 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_Utils.h"
 #include "fpdfsdk/include/pdfwindow/PWL_Wnd.h"
 
-/* ------------------------------- CPWL_Button
- * ---------------------------------- */
-
 CPWL_Button::CPWL_Button() : m_bMouseDown(FALSE) {}
 
 CPWL_Button::~CPWL_Button() {
-  //    PWL_TRACE("~CPWL_Button\n");
 }
 
 CFX_ByteString CPWL_Button::GetClassName() const {
   return "CPWL_Button";
 }
 
 void CPWL_Button::OnCreate(PWL_CREATEPARAM& cp) {
   cp.eCursorType = FXCT_HAND;
 }
 
 FX_BOOL CPWL_Button::OnLButtonDown(const CPDF_Point& point, FX_DWORD nFlag) {
   CPWL_Wnd::OnLButtonDown(point, nFlag);
 
   m_bMouseDown = TRUE;
   SetCapture();
 
   return TRUE;
 }
 
 FX_BOOL CPWL_Button::OnLButtonUp(const CPDF_Point& point, FX_DWORD nFlag) {
   CPWL_Wnd::OnLButtonUp(point, nFlag);
 
   ReleaseCapture();
   m_bMouseDown = FALSE;
 
   return TRUE;
 }