Change bool type to fix warnings.

fpdfsdk/pdfwindow/PWL_Wnd.cpp

Index: fpdfsdk/pdfwindow/PWL_Wnd.cpp
diff --git a/fpdfsdk/pdfwindow/PWL_Wnd.cpp b/fpdfsdk/pdfwindow/PWL_Wnd.cpp
index 8883ceb574d900f0b0f6c5bd34cc3fddaf80e7fb..bb424ffa43c5ee51e40be1adc3b26d1e07fa5d2f 100644
--- a/fpdfsdk/pdfwindow/PWL_Wnd.cpp
+++ b/fpdfsdk/pdfwindow/PWL_Wnd.cpp
@@ -1029,11 +1029,3 @@ FX_BOOL CPWL_Wnd::IsALTpressed(uint32_t nFlag) const {
 
   return FALSE;
 }
-
-FX_BOOL CPWL_Wnd::IsINSERTpressed(uint32_t nFlag) const {
-  if (CFX_SystemHandler* pSystemHandler = GetSystemHandler()) {
-    return pSystemHandler->IsINSERTKeyDown(nFlag);
-  }
-
-  return FALSE;
-}