Remove dead code that was reactivated when fixing overrides.

fpdfsdk/src/formfiller/FFL_ListBox.cpp

Index: fpdfsdk/src/formfiller/FFL_ListBox.cpp
diff --git a/fpdfsdk/src/formfiller/FFL_ListBox.cpp b/fpdfsdk/src/formfiller/FFL_ListBox.cpp
index 0f478fe7e0e3a4bb2dba20b539bfde5ad75dd991..343683016f7ab6c5ac946effb71ad1186d2467c3 100644
--- a/fpdfsdk/src/formfiller/FFL_ListBox.cpp
+++ b/fpdfsdk/src/formfiller/FFL_ListBox.cpp
@@ -228,21 +228,3 @@ CPWL_Wnd* CFFL_ListBox::ResetPDFWindow(CPDFSDK_PageView* pPageView,
 
   return pRet;
 }
-
-void CFFL_ListBox::OnKeyStroke(FX_BOOL bKeyDown, FX_DWORD nFlag) {
-  ASSERT(m_pWidget != NULL);
-
-  int nFlags = m_pWidget->GetFieldFlags();
-
-  if (nFlags & FIELDFLAG_COMMITONSELCHANGE) {
-    if (m_bValid) {
-      CPDFSDK_PageView* pPageView = GetCurPageView();
-      ASSERT(pPageView != NULL);
-
-      if (CommitData(pPageView, nFlag)) {
-        DestroyPDFWindow(pPageView);
-        m_bValid = FALSE;
-      }
-    }
-  }
-}