Move CPDFSDK_Environment code to cpp file

fpdfsdk/formfiller/cffl_combobox.cpp

Index: fpdfsdk/formfiller/cffl_combobox.cpp
diff --git a/fpdfsdk/formfiller/cffl_combobox.cpp b/fpdfsdk/formfiller/cffl_combobox.cpp
index aaddcf5fbc3f2e15201730d896c7880c7acb7dcd..8c0cb645c5f1d5f0338dfe9dffa450665fb6737a 100644
--- a/fpdfsdk/formfiller/cffl_combobox.cpp
+++ b/fpdfsdk/formfiller/cffl_combobox.cpp
@@ -271,8 +271,7 @@ void CFFL_ComboBox::OnSetFocus(CPWL_Wnd* pWnd) {
     int nCharacters = wsText.GetLength();
     CFX_ByteString bsUTFText = wsText.UTF16LE_Encode();
     unsigned short* pBuffer = (unsigned short*)bsUTFText.c_str();
-    m_pEnv->OnSetFieldInputFocus(m_pWidget->GetFormField(), pBuffer,
-                                 nCharacters, TRUE);
+    m_pEnv->OnSetFieldInputFocus(pBuffer, nCharacters, TRUE);
   }
 }