Remove FX_BOOL from fpdfsdk.

fpdfsdk/formfiller/cffl_pushbutton.cpp

Index: fpdfsdk/formfiller/cffl_pushbutton.cpp
diff --git a/fpdfsdk/formfiller/cffl_pushbutton.cpp b/fpdfsdk/formfiller/cffl_pushbutton.cpp
index 4fb7b09cc8a7f805e605ef6dbdf817abbeec768e..9b4121af9d10580fd94c89b308a23ea55e6e5370 100644
--- a/fpdfsdk/formfiller/cffl_pushbutton.cpp
+++ b/fpdfsdk/formfiller/cffl_pushbutton.cpp
@@ -23,9 +23,9 @@ CPWL_Wnd* CFFL_PushButton::NewPDFWindow(const PWL_CREATEPARAM& cp,
   return pWnd;
 }
 
-FX_BOOL CFFL_PushButton::OnChar(CPDFSDK_Annot* pAnnot,
-                                uint32_t nChar,
-                                uint32_t nFlags) {
+bool CFFL_PushButton::OnChar(CPDFSDK_Annot* pAnnot,
+                             uint32_t nChar,
+                             uint32_t nFlags) {
   return CFFL_FormFiller::OnChar(pAnnot, nChar, nFlags);
 }