Convert FWL_ERR into an enum class.

xfa/fxfa/app/xfa_ffimageedit.cpp

Index: xfa/fxfa/app/xfa_ffimageedit.cpp
diff --git a/xfa/fxfa/app/xfa_ffimageedit.cpp b/xfa/fxfa/app/xfa_ffimageedit.cpp
index 16fa0ef06a415ae6b047e6b920dc7dcd54ee14d7..d688aed1a9d487e17c21d11d37d0ddbaacbaef57 100644
--- a/xfa/fxfa/app/xfa_ffimageedit.cpp
+++ b/xfa/fxfa/app/xfa_ffimageedit.cpp
@@ -126,11 +126,11 @@ FX_BOOL CXFA_FFImageEdit::UpdateFWLData() {
 int32_t CXFA_FFImageEdit::OnProcessMessage(CFWL_Message* pMessage) {
   return m_pOldDelegate->OnProcessMessage(pMessage);
 }
-FWL_ERR CXFA_FFImageEdit::OnProcessEvent(CFWL_Event* pEvent) {
+FWL_Error CXFA_FFImageEdit::OnProcessEvent(CFWL_Event* pEvent) {
   CXFA_FFField::OnProcessEvent(pEvent);
   return m_pOldDelegate->OnProcessEvent(pEvent);
 }
-FWL_ERR CXFA_FFImageEdit::OnDrawWidget(CFX_Graphics* pGraphics,
-                                       const CFX_Matrix* pMatrix) {
+FWL_Error CXFA_FFImageEdit::OnDrawWidget(CFX_Graphics* pGraphics,
+                                         const CFX_Matrix* pMatrix) {
   return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }