Change bool type to fix warnings.

fpdfsdk/pdfwindow/PWL_Wnd.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 <map>
 
 #include "fpdfsdk/pdfwindow/PWL_ScrollBar.h"
 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
@@ skipping 1011 matching lines @@
   return FALSE;
 }
 
 FX_BOOL CPWL_Wnd::IsALTpressed(uint32_t nFlag) const {
   if (CFX_SystemHandler* pSystemHandler = GetSystemHandler()) {
     return pSystemHandler->IsALTKeyDown(nFlag);
   }
 
   return FALSE;
 }
-
-FX_BOOL CPWL_Wnd::IsINSERTpressed(uint32_t nFlag) const {
-  if (CFX_SystemHandler* pSystemHandler = GetSystemHandler()) {
-    return pSystemHandler->IsINSERTKeyDown(nFlag);
-  }
-
-  return FALSE;
-}