Make the I in IFormFiller explicit

fpdfsdk/formfiller/cffl_radiobutton.cpp

Index: fpdfsdk/formfiller/cffl_radiobutton.cpp
diff --git a/fpdfsdk/formfiller/cffl_radiobutton.cpp b/fpdfsdk/formfiller/cffl_radiobutton.cpp
index 8e782d0eb931d545b907c7bb0a17592161faff38..088bf0e3c8a4f246b95ed72b892a832cebc3f165 100644
--- a/fpdfsdk/formfiller/cffl_radiobutton.cpp
+++ b/fpdfsdk/formfiller/cffl_radiobutton.cpp
@@ -46,14 +46,16 @@ FX_BOOL CFFL_RadioButton::OnChar(CPDFSDK_Annot* pAnnot,
   switch (nChar) {
     case FWL_VKEY_Return:
     case FWL_VKEY_Space: {
-      CFFL_IFormFiller* pIFormFiller = m_pEnv->GetIFormFiller();
+      CFFL_InteractiveFormFiller* pInteractiveFormFiller =
+          m_pEnv->GetInteractiveFormFiller();
       CPDFSDK_PageView* pPageView = pAnnot->GetPageView();
       ASSERT(pPageView);
 
       FX_BOOL bReset = FALSE;
       FX_BOOL bExit = FALSE;
 
-      pIFormFiller->OnButtonUp(m_pWidget, pPageView, bReset, bExit, nFlags);
+      pInteractiveFormFiller->OnButtonUp(m_pWidget, pPageView, bReset, bExit,
+                                         nFlags);
 
       if (bReset)
         return TRUE;