Cleanup fwl_* classes and cfx_* classes in fwl.

xfa/fwl/core/ifwl_form.cpp

Index: xfa/fwl/core/ifwl_form.cpp
diff --git a/xfa/fwl/core/ifwl_form.cpp b/xfa/fwl/core/ifwl_form.cpp
index 4a8d911976eefe46c54ee4df48279e5983d073a7..9e632a009acea72dcac4658fd1d1d1f1e50bcd36 100644
--- a/xfa/fwl/core/ifwl_form.cpp
+++ b/xfa/fwl/core/ifwl_form.cpp
@@ -329,7 +329,9 @@ IFWL_Widget* IFWL_Form::DoModal() {
   if (!pDriver)
     return nullptr;
 
-  m_pNoteLoop.reset(new CFWL_NoteLoop(this));
+  m_pNoteLoop = pdfium::MakeUnique<CFWL_NoteLoop>();
+  m_pNoteLoop->SetMainForm(this);
+
   pDriver->PushNoteLoop(m_pNoteLoop.get());
   m_bDoModalFlag = true;
   SetStates(FWL_WGTSTATE_Invisible, false);